Changing your own engine oil is one of the most valuable maintenance jobs you can do at home. Fresh oil helps lubricate, cool, clean and protect the engine. Old or contaminated oil, on the other hand, can increase wear, reduce performance and contribute to sludge build-up inside the engine.
In this complete guide, we explain how to change your own oil, how long an oil change usually takes, whether engine oil can age, how to recognise old or contaminated oil and how to choose the right oil for your car. We also explain when an engine flush makes sense and which products can help you carry out the job properly.
Need products for your oil change? View our range of engine oil, engine flush products, Lindemann Oil System Cleaner, Lindemann Engine Performance Treatment and practical funnels for clean refilling.
Why changing engine oil matters
Engine oil works under extreme conditions. It has to deal with heat, pressure, combustion residues, soot, moisture and microscopic metal particles. Over time, the oil loses part of its protective properties. The additives in the oil are gradually used up, contamination builds up and the oil becomes less effective at protecting the engine.
Fresh engine oil helps with:
- Lubrication: reducing friction between moving metal parts.
- Cooling: carrying heat away from critical engine components.
- Cleaning: transporting dirt, soot and combustion residues to the oil filter.
- Protection: reducing corrosion, deposits and premature wear.
- Sealing: helping maintain compression around the piston rings.
- Noise reduction: supporting smoother and quieter engine operation.
Skipping oil changes can result in thicker oil, sludge formation, blocked oil channels, increased oil consumption, noisy hydraulic lifters and accelerated engine wear. That is why oil changes should be treated as preventive maintenance, not just as a repair after problems appear.
Can engine oil age?
Yes, engine oil can age. This happens both inside the engine and during storage. Once oil is in use, it is exposed to heat cycles, oxygen, fuel residues, soot, water condensation and combustion by-products. These factors gradually break down the oil and reduce its ability to protect the engine.
Oil can also age in the bottle, especially when stored incorrectly. A sealed bottle of engine oil generally lasts much longer than oil inside an engine, but it should still be stored properly: cool, dry, away from direct sunlight and with the cap tightly closed.
Why oil ages faster in some engines
Some driving conditions accelerate oil ageing. These include:
- many short journeys where the engine does not fully warm up;
- frequent cold starts;
- stop-start city driving;
- towing, heavy loads or sporty driving;
- turbocharged engines with high oil temperatures;
- diesel engines that produce more soot contamination;
- engines with delayed oil changes or poor maintenance history.
If your car is mainly used for short trips, the mileage interval alone may not tell the whole story. In that case, time-based oil changes are just as important as mileage-based oil changes.
How to recognise old or contaminated oil
Old oil is not always easy to judge by colour alone. Diesel engine oil, for example, can turn dark fairly quickly because it holds soot in suspension. However, there are several warning signs that may indicate the oil is old, contaminated or no longer working properly.
- Very thick or sticky oil: oil that looks like syrup or tar may be heavily aged or contaminated.
- Burnt smell: a strong burnt smell can indicate overheating or degraded oil.
- Sludge under the oil cap: thick black deposits or mayonnaise-like residue can point to moisture, short trips or internal contamination.
- Metallic particles: shiny particles on the dipstick or in drained oil may indicate internal wear.
- Engine ticking or rattling: poor lubrication can make hydraulic lifters or timing components noisy.
- Oil warning light: this should never be ignored, especially if it is red.
- Oil level dropping quickly: frequent topping up may indicate oil consumption, leaks or internal wear.
If the oil looks extremely dirty or sludge-like, simply topping it up is not enough. The old oil should be drained and replaced, and in many cases the oil filter should be replaced as well. If there is heavy contamination, an engine flush may help clean the oil system before the new oil is added.
How long does an oil change take?
A basic oil change usually takes around 30 to 60 minutes if you have the correct tools, oil, oil filter and a safe place to work. If you also use an engine flush, allow extra time because the engine must run at idle with the cleaner before the old oil is drained.
As a general estimate:
| Job | Estimated time |
|---|---|
| Basic oil and filter change | 30 to 60 minutes |
| Oil change with engine flush | 60 to 90 minutes |
| First time doing it yourself | 60 to 120 minutes |
| Professional workshop oil service | Usually 30 to 45 minutes, depending on planning and vehicle type |
The job can take longer if the drain plug is difficult to reach, the undertray must be removed, the oil filter is in a tight location or the wrong tools are used. Preparation makes a big difference.
What oil goes in my engine?
The correct engine oil depends on the engine design, fuel type, production year, emission system and manufacturer approval. It is not enough to choose oil based only on viscosity, such as 5W-30 or 5W-40. Two oils with the same viscosity can have different specifications and may not both be suitable for your engine.
When choosing engine oil, check the following:
- Viscosity: examples include 0W-20, 0W-30, 5W-30, 5W-40 and 10W-40.
- Manufacturer approval: for example approvals from Volkswagen, Mercedes-Benz, BMW, Opel, Ford, Renault or PSA/Stellantis.
- ACEA or API classification: these indicate oil performance categories.
- Emission system compatibility: vehicles with DPF, GPF or catalytic converters may require low-SAPS oil.
- Engine condition: high-mileage or worn engines may benefit from a different approach than a new engine.
Always check the owner’s manual, service booklet or manufacturer specifications before ordering engine oil. If you are unsure, it is better to verify the exact specification than to guess based on viscosity alone.
Which oil should I use in my car?
Many drivers search for “which oil for my car” and expect one simple answer. In reality, the best oil depends on the exact vehicle, engine code and manufacturer requirements. A modern turbocharged petrol engine may need a very different oil from an older diesel engine, even if both vehicles seem similar in size or power.
At Dutch Performance Products, you can find different types of engine oil for petrol, diesel, LPG and hybrid vehicles. Common options include:
- 0W-20 engine oil – often used in modern low-friction engines and selected hybrid vehicles.
- 0W-30 engine oil – used in various modern engines requiring a thinner cold-start oil.
- 5W-30 engine oil – widely used in modern passenger cars and light commercial vehicles.
- 5W-40 engine oil – suitable for many petrol and diesel engines, including engines under heavier load.
- 10W-40 engine oil – often used in older engines or engines with different oil requirements.
If your vehicle has a diesel particulate filter, turbocharger, timing chain or start-stop system, choosing the correct specification is especially important. The wrong oil can increase wear, contaminate emission systems or cause poor cold-start protection.
Should you use an engine flush before changing oil?
An engine flush is a cleaning product that is added to the old engine oil before draining it. The purpose is to loosen sludge, varnish, deposits and contamination inside the oil system. After the flush has done its work, the old oil is drained and replaced with fresh engine oil and a new oil filter.
Lindemann Oil System Cleaner is designed to clean the internal oil system before an oil change. It can be used to help remove deposits from components such as oil channels, piston ring areas, hydraulic lifters and other lubricated parts.
An engine flush can be useful when:
- the oil is very dirty or overdue for replacement;
- the engine has a history of short-distance driving;
- there is sludge or contamination in the oil system;
- hydraulic lifters are ticking due to oil contamination;
- you want to clean the system before adding fresh oil;
- you are switching from old, degraded oil to high-quality new oil.
Important: an engine flush should be used before the oil change, not after. Add it to the old oil, let the engine idle according to the product instructions, then drain the old oil while it is warm. Do not drive the vehicle while the flush is in the oil unless the product instructions specifically allow it.
When should you avoid an engine flush?
Although an engine flush can be very useful, it is not always the right solution. Be careful with severely neglected engines, engines with extremely high mileage, engines with very low oil pressure or engines that already have mechanical damage.
In heavily worn engines, deposits may sometimes mask existing wear or leaks. Cleaning the system can reveal problems that were already present. If your engine knocks loudly, has very low oil pressure, burns large amounts of oil or has severe sludge, get professional advice before flushing.
Products you need for a DIY oil change
Before you start, make sure you have everything ready. An oil change becomes messy and frustrating if you discover halfway through that you are missing a tool, filter or container.
- Correct engine oil: choose the right viscosity and manufacturer specification from our engine oil range.
- New oil filter: always replace the oil filter when changing oil.
- Drain plug washer: replace it if required by your vehicle.
- Oil drain pan: use a container large enough for the full oil capacity.
- Socket or spanner: needed to remove the drain plug.
- Oil filter wrench: useful if the filter is difficult to remove by hand.
- Funnel: a 4-piece funnel set helps prevent spills when adding fresh oil.
- Gloves and cleaning cloths: engine oil can be dirty and difficult to remove from skin and surfaces.
- Engine flush: use Lindemann Oil System Cleaner if the oil system needs internal cleaning.
- Oil additive: after the oil change, Lindemann Engine Performance Treatment can be added to the fresh oil to help reduce friction and support smoother engine operation.
How to change your own engine oil step by step
Always work safely. Park the vehicle on a flat surface, use axle stands if the car needs to be raised and never rely only on a jack. Hot oil can cause burns, so wear gloves and take your time.
Step 1: Warm up the engine
Warm oil flows more easily than cold oil and carries more contamination with it when drained. Let the engine reach normal operating temperature, then switch it off. Wait a few minutes so the oil is hot but not dangerously hot to work around.
Step 2: Add engine flush if needed
If you are using Lindemann Oil System Cleaner, add it to the old oil before draining. Let the engine idle according to the product instructions. Do not drive the car during this process. After the flush cycle, switch off the engine and prepare to drain the oil.
Step 3: Open the oil filler cap
Remove the oil filler cap on top of the engine. This helps the oil drain more smoothly. You can also pull the dipstick slightly out if your car has one.
Step 4: Position the drain pan
Place a drain pan underneath the sump drain plug. Make sure the container is large enough for the full oil capacity of your engine. Most passenger cars hold several litres of oil, so do not use a small bucket or bottle.
Step 5: Remove the drain plug
Carefully loosen the drain plug with the correct tool. Oil may come out quickly, especially when warm. Keep your hands clear and allow the oil to drain fully. This can take several minutes.
Step 6: Remove and replace the oil filter
Remove the old oil filter. Some oil may spill, so keep cloths nearby. Lightly lubricate the rubber seal of the new filter with fresh oil before installing it. Tighten it according to the manufacturer’s instructions. Do not overtighten.
Step 7: Refit the drain plug
Once the oil has fully drained, clean the area around the drain hole and refit the drain plug. Replace the washer if needed. Tighten the plug correctly, but do not overtighten because this can damage the thread in the sump.
Step 8: Add fresh engine oil
Use a clean funnel and add the correct engine oil slowly. Start with slightly less than the total specified capacity. This prevents overfilling. Wait a moment, then check the level using the dipstick or electronic oil level system.
Step 9: Start the engine briefly
Start the engine and let it idle briefly. This allows oil to circulate and fill the new oil filter. Check around the drain plug and oil filter for leaks. Switch the engine off and wait a few minutes.
Step 10: Check the oil level again
After the oil has settled, check the level again. Top up in small amounts if needed. The level should sit between the minimum and maximum marks, ideally close to maximum but not above it.
Step 11: Add oil treatment if desired
After the oil and filter have been replaced, you can add Lindemann Engine Performance Treatment to the fresh oil. This oil additive is designed to help reduce friction, support smoother running and protect internal engine components. Do not use oil additives in engines where the manufacturer specifically advises against them, and follow the product instructions.
Recommended product €28,72
What to do with old engine oil
Used engine oil must never be poured down the drain, onto the ground or into household waste. It contains contaminants and must be disposed of responsibly. Pour the used oil into a sealable container and take it to a recycling centre, waste collection point or garage that accepts used oil.
The same applies to the old oil filter. It still contains oil and should be treated as chemical waste.
Common mistakes when changing oil yourself
A DIY oil change is not difficult, but small mistakes can cause big problems. Avoid these common errors:
- Using the wrong oil: viscosity alone is not enough; always check the required specification.
- Overfilling the engine: too much oil can cause foaming, pressure issues and intake contamination.
- Forgetting the oil filter: a fresh oil change should include a new filter.
- Not replacing the drain plug washer: this can lead to leaks.
- Overtightening the drain plug: this can damage the sump thread.
- Starting the engine without enough oil: always add oil before starting.
- Ignoring leaks after the oil change: check the drain plug and filter area after starting the engine.
- Using an engine flush incorrectly: do not drive with a flush in the oil unless the product instructions allow it.
Oil change or just topping up?
Topping up and changing oil are different jobs. Topping up corrects the level. Changing oil replaces old, contaminated oil with fresh oil.
| Situation | Best action |
|---|---|
| Oil level is slightly low but oil looks normal | Top up with the correct oil |
| Oil is dark, thick or smells burnt | Change the oil and filter |
| Sludge is visible under the oil cap | Consider oil change with engine flush |
| Oil warning light is red | Stop immediately and investigate the cause |
| Oil level keeps dropping | Check for leaks or oil consumption |
| Maintenance interval has been exceeded | Replace oil and filter as soon as possible |
How often should you change engine oil?
The correct oil change interval depends on the vehicle, engine, oil type and driving conditions. Always follow the manufacturer’s maintenance schedule, but remember that severe driving conditions can require more frequent oil changes.
You may need to change oil more often if:
- you mainly drive short trips;
- you drive in heavy traffic or stop-start conditions;
- you tow trailers or caravans;
- the engine has high mileage;
- the car is tuned or driven hard;
- the oil becomes contaminated quickly;
- the vehicle has a known history of sludge or oil consumption.
For many drivers, changing oil based on both mileage and time is the safest approach. Even if you drive very little, oil still ages inside the engine.
Quick checklist for a successful DIY oil change
- Check which engine oil specification your vehicle requires.
- Order the correct amount of oil and a new oil filter.
- Prepare tools, gloves, drain pan, funnel and cleaning cloths.
- Warm up the engine so the old oil drains properly.
- Use Lindemann Oil System Cleaner before draining if internal cleaning is needed.
- Drain the old oil completely.
- Replace the oil filter.
- Refit the drain plug with a good washer.
- Refill with fresh engine oil.
- Start the engine and check for leaks.
- Recheck the oil level after a few minutes.
- Dispose of old oil and filter responsibly.
Recommended products for your oil change
For a clean and effective oil change, the following products are useful:
- Engine oil – choose the correct viscosity and specification for your vehicle.
- Lindemann Oil System Cleaner – engine flush for cleaning the oil system before draining old oil.
- Lindemann Engine Performance Treatment – oil additive for use after the oil change to help reduce friction and support smoother engine operation.
- Lindemann Worn Engine Treatment – suitable for engines with noticeable wear or higher mileage.
- 4-piece funnel set – helps refill oil cleanly without spilling.
Frequently asked questions about changing engine oil
Can engine oil go bad?
Yes. Engine oil can age due to heat, oxygen, moisture, fuel dilution, soot and contamination. Oil inside the engine ages faster than sealed oil stored correctly in a bottle.
How long does an oil change take?
A basic oil change usually takes around 30 to 60 minutes. If you use an engine flush or are doing the job for the first time, allow extra time.
What oil goes in my engine?
The correct oil depends on your engine type, manufacturer approval, viscosity requirement and emission system. Always check the owner’s manual or manufacturer specification before ordering oil.
How do I know if my oil is old or contaminated?
Warning signs include thick or sticky oil, a burnt smell, sludge under the oil cap, metallic particles, engine ticking, frequent oil top-ups or oil warning lights.
Should I use an engine flush every oil change?
Not always. An engine flush is useful when the oil system is dirty, maintenance has been delayed or sludge is present. For well-maintained engines, it may be used periodically rather than every time.
Can I change oil without replacing the oil filter?
It is not recommended. The old filter contains dirty oil and trapped contaminants. For proper maintenance, replace the oil filter with every oil change.
Conclusion
Changing your own engine oil is a practical way to maintain your vehicle and protect the engine from unnecessary wear. The most important steps are choosing the correct oil, draining the old oil properly, replacing the oil filter and checking the level carefully after refilling.
Engine oil can age, even if you do not drive many kilometres. Short trips, cold starts, soot, moisture and heat all contribute to oil degradation. If the oil is old, dirty, thick or contaminated, an oil change is far more effective than simply topping up.
For best results, use high-quality engine oil, clean the system when needed with Lindemann Oil System Cleaner and refill cleanly using a funnel set. After the oil change, Lindemann Engine Performance Treatment can be added to help support smoother running and reduce friction.
