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

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

🛡️Self-regenerating anti-wear layer

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€ 62.99

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Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Keep your engine running like new — because your ride deserves the best!

UNIVERSAL COMPATIBILITY - Works seamlessly with petrol & diesel engines using mineral or semi-synthetic oils.
SELF HEALING METAL SHIELD - Anti-wear agents form a protective surface that regenerates, extending engine life.
STRESS TESTED FOR REAL LIFE - Ideal for heavy loads, towing, stop-and-go traffic, and extreme weather conditions.
CLEAN ENGINE PEAK PERFORMANCE - Dispersants keep sludge and deposits at bay, ensuring optimal engine cleanliness.
ENGINE ARMOR AGAINST HEAT FRICTION - Proprietary friction modifier creates a slick lubrication layer for cooler, smoother rides.

Slick-50 61399750 Engine Treatment (750ml) is a cutting-edge additive designed to reduce engine friction and heat through a proprietary lubrication layer. It forms a self-regenerating anti-wear surface, prevents sludge buildup, and is compatible with petrol and diesel engines using mineral or semi-synthetic oils. Perfect for high-stress driving conditions, it helps extend engine life, improve fuel efficiency, and reduce costly repairs.

Specifications

ASIN	B007JL126Y
Automotive Fit Type	Universal Fit
Best Sellers Rank	5,096 in Automotive ( See Top 100 in Automotive ) 16 in Engine Oil Additives
Brand Name	Slick 50
Compatible with Vehicle Type	Car
Container Type	Bottle
Country Of Origin	España
Customer Reviews	4.7 4.7 out of 5 stars (1,240)
Item Type Name	Engine Treatment
Liquid Volume	750 Millilitres
Manufacturer	Slick 50
Manufacturer Part Number	SCK61399750-GL
Manufacturer Warranty Description	2 year manufacturer
Model Number	61399750
SAE J300 Viscosity Grade	5W-30
Size	750ml
Unit Count	750.0 millilitre

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