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Best Oil Viscosity For R32 Gtr Running 270Awkw And On E85

boobeedoobee

By boobeedoobee,
in General Maintenance

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Missileman Veteran

Missileman

Posted
Posted (edited)

Depends on your application, try reading the sticky plenty of info and opinions there. There is also another thread dealing ethanol blends and oil, try the search button.

Edited by Missileman
Jazzadub Enthusiast

Jazzadub

Posted
Posted

For E85 it is very important that the oil is API SN rated, and ideally a full synthetic.

This is the notes from API on the SN rating:

"Introduced in October 2010 for 2011 and older vehicles, designed to provide improved high temperature

deposit protection for pistons, more stringent sludge control, and seal compatibility. API SN with Resource
Conserving matches ILSAC GF-5 by combining API SN performance with improved fuel economy, turbocharger
protection, emission control system compatibility, and protection of engines operating on ethanol-containing
fuels up to E85."
As for viscosity that very much depends on the temperature range.
A cold grade of 15W is fine unless it gets below freezing, which I don't think will be a problem.
A hot grade of 50 will start being too thin at about 130C+ (ie less than 10cst), but if it is a full synthetic it will not break down until 200C or more (it will just have really low viscosity).
So for track use that is good, you just want to make sure you don't beat on it until it's nice and warm.
That is because at say 70C a 40 grade might have thinned to the correct viscosity to protect the engine, but a 50 grade might still be too thick.
Higher grades also have better film strength, which is why a 50 is good for the track.
MrStabby Grand Master

MrStabby

Posted
Posted

IMO the information in the oil sticky is the usual set of old wives tales and general ignorance. Suggest you go to www.bobistheoilguy.com/forums instead, at least there are some real experts there.

FWIW i use Mobil 1 0W-40 in my 300kw GTR (which gets tracked) and Stag (the daily).

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