How many tins are needed for big engines

Since the reason for using it is to seal leaky seals- especially the rear crankshaft seal - size doesn't Matter.I used it in my 2 litre engine and it worked well. Hope this is helpful.

do you just put it in engine and thats it or do you need to drain oil first

Just add to engine as if topping up oil -- follow instructions on can. It made a significant difference to my engine. If your engine is due for a routine oil change then do this first and add Stop Leak with new oil.

Will it stop oil coming out of the manifold on a Nuffield tractor?

It's really designed to soften old seals that have become stiff and letting oil pass, it doesn't stop oil leaking from splits etc

can this be sprayed directly onto rubber parts?

I apply it once a year on all rubber in suspension and joints behind the wheel area. Simply pour it into a spray bottle and spray on those parts generously. It well protects them and last them longer. Just a few weeks ago I used on my sister's 2003 Ibiza who was annoyingly making squeaky noise on the right suspension area, now it is gone. A tin would be more than enough for your car all over. I got this idea from a car mechanic in this business for over 50 years.

Wynns Engine Oil Stop Leak Additive Prevents And Stops Oil

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥3174

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Description

🛠️ Stop leaks before they start — keep your engine running like new!

SEAL SAVIOR - Restores flexibility to dried-out rubber & neoprene seals, stopping leaks at the source.
ENGINE GUARDIAN - Forms a protective barrier against heat, oxidation, and wear to extend engine life.
NO ENGINE TEAR DOWN - Works without disassembly—easy, fast, and mess-free maintenance.
ECO EMISSION FRIENDLY - Safe for catalytic converters and emission control systems, keeping your ride green.
UNIVERSAL COMPATIBILITY - Safe for petrol, diesel, LPG engines and all mineral & synthetic oils, including low SAPS.

Wynn's Engine Oil Stop Leak Additive is a 325ml high-performance formula designed to restore and protect engine seals by rehydrating rubber and neoprene components. It prevents and stops oil leaks without altering oil viscosity or requiring engine disassembly. Compatible with all engine types and oils, it safeguards engine efficiency, reduces oil consumption, and is safe for emission systems, making it an essential maintenance solution for professionals and enthusiasts alike.

Specifications

ASIN	B0031ROB36
Best Sellers Rank	416 in Automotive ( See Top 100 in Automotive ) 3 in Engine Oil Additives
Brand	Wynn's
Customer Reviews	4.3 4.3 out of 5 stars (3,364)
Date First Available	23 Dec. 2009
Guaranteed software updates until	unknown
Item Weight	325 g
Item model number	50664
Manufacturer	Wynn Oil UK
Manufacturer part number	50664
Model	50664
Product Dimensions	5 x 5 x 11.99 cm; 325 g

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