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.

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Wynn's Engine Oil Stop Leak Additive - Prevents & Stops Oil Leaks - 325ml

Product ID: 47965949

⏱️Fast-acting seal restoration

♻️Compatible with all oil types

🛡️Protects seals & engine parts

¥3296

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal the deal on leaks before they seal your fate!

EXTEND ENGINE LIFE - Lubricates seals to protect against heat, oxidation, and wear
STOP LEAKS AT THE SOURCE - Restores rubber & neoprene seals to prevent oil drips and costly repairs
ENGINE SAFE ECO FRIENDLY - Safe for petrol, LPG, diesel engines, and catalytic converters
UNIVERSAL OIL COMPATIBILITY - Works seamlessly with mineral, synthetic, and low SAPS oils
NO ENGINE DISASSEMBLY NEEDED - Quick, hassle-free application saves time and money

Wynn's Engine Oil Stop Leak Additive is a 325ml high-performance formula designed to restore flexibility to aging engine seals, stopping oil leaks without engine teardown. Compatible with all oil types and fuel systems, it protects seals from heat and wear while maintaining engine efficiency and safeguarding emission systems.

Specifications

ASIN	B0031ROB36
Best Sellers Rank	355 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 (3,358)
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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