is this size (500ml) ok for a 2.8litre engine

No, you will need 750ml for a 2.8 litre engine

Is 500ml okay for Vauxhall insignia

For engines up to 1400cc use the 500ml bottle, for engines above 1400 use the 750ml bottle. If your Vauxhall is an automatic then I wouldn't use it at all as you could do more harm than good.

Can I use a small quantity in my power steering

Sorry, I don't know but suspect the answer would be 'no'. I think the way this stuff works is that it provides a slippy lubricant on the engine cylinders i.e. I've used this (snake oil) on several cars in the oil but only ever been persuaded it works when an old bmw E30 325 virtually lost all its oil but still ran ok and didn't seize or overheat.

Will this quieten my diesel engine which suffers from diesel knock ??

No sorry it is my understanding it will not. Knocking is more or less unavoidable in diesel engines, where fuel is injected into highly compressed air towards the end of the compression stroke. There is a short lag between the fuel being injected and combustion starting. It doesnt have anything to do with friction as such nor can it be reduced or removed with slick 50. Hope that helps.

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Slick-50 61399750 Engine Treatment 750ml

Slick-50 61399750 Engine Treatment 750ml

Product ID: 49424931

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Details

Viscosity
5W-30
Brand
Slick 50
Vehicle service type
Car
Automotive Fit Type
Universal Fit
Manufacturer
Slick 50

🔥Reduces friction heat

🧼Prevents sludge buildup

🛡️Self-regenerating anti-wear layer

Description

🛠️ Keep your engine running smoother, longer — because your drive deserves the best!

HEAVY DUTY READY - Perfect for towing, heavy loads, and stop-and-go traffic conditions
ULTIMATE HEAT DEFENSE - Minimizes friction-generated heat for peak engine performance under stress
SELF HEALING PROTECTION - Forms a dynamic anti-wear shield that prolongs engine life
UNIVERSAL COMPATIBILITY - Works seamlessly with petrol & diesel engines and all major oil types
ENGINE CLEANLINESS BOOST - Dispersant technology keeps your engine spotless and efficient

Slick-50 61399750 Engine Treatment (750ml) is a high-performance additive designed to reduce friction and heat in engines, protect metal parts with a self-regenerating anti-wear layer, and prevent sludge buildup. Compatible with all major mineral and semi-synthetic oils, it enhances engine durability and efficiency for both petrol and diesel vehicles, especially under heavy load or stressful driving conditions.

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