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

Product ID: 49424931

Details

Brand
Slick 50
Liquid volume
750
Package information
Bottle
SAE J300 Viscosity Grade
5W-30
Vehicle service type
Car

🔥Reduces friction heat

🧼Prevents sludge buildup

🛡️Anti-wear protective layer

S/.217

Duties & taxes included

In stock

Sold byAmazon PeruDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚗 Keep your engine slick, smooth, and unstoppable!

HEAT FRICTION SLAYER - Proprietary friction modifier cuts heat and friction, ensuring smoother rides under stress.
ULTIMATE ENGINE SHIELD - Forms a self-regenerating anti-wear barrier for long-lasting engine protection.
CLEAN MACHINE GUARANTEE - Dispersant technology keeps your engine spotless by preventing sludge and deposits.
FUEL EFFICIENCY BOOSTER - Smoother engine operation can reduce fuel consumption and costly breakdown risks.
UNIVERSAL COMPATIBILITY - Works seamlessly with petrol & diesel engines using mineral or semi-synthetic oils.

Slick-50 Engine Treatment (750ml) is a universal-fit additive designed to protect engines up to 3000cc by reducing friction and heat through a proprietary friction modifier and anti-wear agents. Compatible with petrol and diesel engines using mineral or semi-synthetic oils, it prevents sludge buildup and enhances engine longevity, especially under high-stress conditions like towing or heavy traffic. Trusted by over 1,200 users with a 4.7-star rating, it also supports fuel efficiency and reduces breakdown risks.

Specifications

ASIN	B007JL126Y
Automotive Fit Type	Universal Fit
Best Sellers Rank	2,681 in Automotive ( See Top 100 in Automotive ) 13 in Engine Oil Additives
Brand	Slick 50
Brand Name	Slick 50
Compatible with Vehicle Type	Car
Container Type	Bottle
Country Of Origin	España
Customer Reviews	4.7 out of 5 stars 1,254 Reviews
Item Type Name	Engine Treatment
Liquid Volume	750 Millilitres
Liquid volume	750 Millilitres
Manufacturer	Slick 50
Manufacturer Part Number	SCK61399750-GL
Manufacturer Warranty Description	2 year manufacturer
Model Number	61399750
Number of Packs	1
Package information	Bottle
SAE J300 Viscosity Grade	5W-30
Size	750ml
Unit Count	750.0 millilitre
Vehicle service type	Car

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