Engine Protectors

What does an engine protector actually do?

Engine oil alone cannot always maintain a full protective film at the moments when wear is highest. An engine protector works through the oil circuit to reinforce that film during cold starts, stop-start driving, and periods of high load, when the oil is most vulnerable. In a well-maintained engine with a reasonable service history, the added value is real but modest: the product supports wear protection rather than transforming it. In a high-mileage or hard-used engine, where clearances have grown and the oil film is already under more stress, the benefit is more noticeable. Any improvements are subtle and gradual, typically becoming apparent after several hundred kilometres of driving.

Does:

• Strengthen the lubricating film at cold starts, in stop-start traffic, and under high load
• Reduce metal-to-metal contact at cams, lifters, bearings, and piston skirts
• Support smoother, quieter running in engines with mild wear or noise
• Complement correct oil and regular servicing as an extra layer of protection

Does not:

• Repair broken components, severe bearing damage, or major compression loss
• Replace the correct oil grade or make a wrong-spec oil suitable for your engine
• Fix significant oil leaks or stop heavy oil consumption from worn rings or seals
• Deliver tuning or performance gains

Which engine protector fits your situation?

The choice between the two products comes down to one question: what condition is your engine in?

The Engine Performance Treatment is formulated for engines that are still in decent condition. If your engine has clear signs of wear, such as audible ticking, slightly increased oil consumption, or a rougher idle than before, the Worn Engine Treatment is the appropriate choice. It is formulated to work in conditions where clearances have grown and the oil film is already under more strain. If you suspect sludge or have an engine with a patchy service history, run an Engine Flush before the oil change first. Adding a protector to a contaminated oil system reduces its effectiveness.

How and when do you add an engine protector?

Add the engine protector directly after a fresh oil fill at your regular oil change, not as a top-up between services. Between changes, any topping up should be done with the correct engine oil, not with additive alone. You can add it yourself at home or have it done at a garage during a service.

• When to add: immediately after the new oil fill, not mid-interval
• Dosage: follow the ml per litre of oil stated on the product label, based on your engine's total oil capacity (check your owner's manual)
• Overdosing: adding more than specified does not improve protection and can alter the oil's viscosity balance; stay within the stated amount
• Frequency: once per oil change for continuous protection
• Stacking: do not combine multiple engine protectors or mix brands in the same sump; one product at the correct dose is both safer and more effective
• If flushing first: complete the Engine Flush and drain before the oil change, then add the protector to the fresh oil fill

Is an engine protector safe for your engine type and oil?

Safe for:

• Turbocharged petrol and diesel engines, provided you are already using an oil that meets your engine's specification
• Synthetic, semi-synthetic, and mineral engine oils, including modern low-viscosity grades such as 0W20
• Engines equipped with a DPF or catalytic converter: the product works inside the oil circuit and does not affect the fuel system or exhaust aftertreatment when used at the correct dose
• Start-stop systems and mild hybrid engines, as long as the engine oil specification is respected
• Engines under manufacturer warranty, provided you continue to use the OEM-specified oil grade and follow the manufacturer's service intervals

Use with caution or avoid:

• Very old engines with a heavy sludge build-up or completely unknown service history: clean the system with Engine Flush first
• Engines where oil pressure is already marginal or fluctuating: adding any product to a system under stress is not the right first step; have the cause diagnosed before proceeding
• Engines requiring specialist or exotic oil specifications not covered by the product label: check compatibility before adding anything

An engine protector is not a seal conditioner or gasket repair product and should not be used with that expectation. Using it correctly at the stated dose does not meaningfully alter the oil's viscosity grade. Regarding warranty: using an engine protector does not automatically void it, but you remain responsible for using the correct oil grade and observing the manufacturer's change intervals. If in doubt, check your owner's manual or ask your dealer first.

When is an engine protector not the right solution?

An engine protector strengthens a working lubrication system. It cannot diagnose a fault, repair a broken component, or compensate for a symptom that has a mechanical cause. If you are considering adding a product because you have noticed something worrying, it is worth being honest about whether the symptom calls for a product or a professional check.

Go to a garage rather than reaching for a product if you notice:

• An engine warning light that is on or flashing
• Oil pressure that is fluctuating or dropping sharply
• Oil consumption that is severe
• A knocking or worsening engine noise, rather than a mild occasional tick
• Suspected compression loss, such as a noticeably weak cylinder or running on fewer cylinders
• A significant oil leak from a gasket or seal

For minor leaks from hardened or aging seals, Oil Leak Stop is the more relevant product. For sludge removal before an oil change, Engine Flush is the correct starting point. If the issue is specifically sticky lifter noise rather than general wear, a Hydraulic Lifter Cleaner addresses that more directly than a wear protector.

If you are unsure whether your engine's condition calls for the Performance Treatment or the Worn Engine Treatment, use mileage and symptoms as your guide: no noticeable wear signs points to the Performance Treatment, any audible or measurable sign of wear points to the Worn Engine Treatment. If you are still uncertain, our customer service team can help you choose before you order.