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Old 2010-03-16, 10:52 AM   #42
sperry
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Real Name: Scott
Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
 
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
 
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Quote:
Originally Posted by cody View Post
Sure, but are you saying that there's never a chance for a bad interaction between two gear fluids? I know they're designed to be compatible with eachother since there's always some of the previous fluid left over, but I'm surprised that there's no such thing as a bad interaction (like breaking down faster, unforseen reactions, etc) when mixed full strength. I mean, manufacturers test their formulas by themselves, not mixed with every other fluid out there. Maybe I'm just being paranoid, but that's how I am with my car.
I wouldn't go so far as to say there can't be a weird reaction... but blending similar oils should be akin to blending different octane gas. No one freaks out if you mix 100 octane and 91 octane to bump to 93 octane, right? Mixing a 5w30 and 15w50 is going to result in a 10w40 or thereabouts. Mixing ultralight shockproof and heavyweight shockproof is going to give you lightweight shockproof or thereabouts.

And apparently mixing that Motul into lightweight shockproof is just going to lighten up the cold performance of the shockproof according to Andrewtech. Now, I probably wouldn't go around testing my own blends just because I don't want to deal with the carnage if I lighten something too much... but I'd trust a reputable gearbox shop like Andrewtech because they've probably seen it all and tried it all themselves.
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