Heres what I've found with Tranny Oil

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Aug 26, 2008, 03:26 PM

#61

mrfred

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Quote:

Originally Posted by migs647

This is indeed the case. Mitsubishi designs their transmissions AROUND the gear oil. The material the synchros are made of... brass in this case is corrosive with the additives that are put into GL5. You can find this happening all over evom. From regular lancers, to ralliarts, to evos. So many people have toasted trannys because of running Mobil 1's GL5. Stick with GL4 and you'll be in much better shape for longevity.

A GL5-only gear oil is not suitable, but many of the newer gear oils now conform to a newer mil spec qualification that requires better compatibility with copper containing components than the GL4 spec while having better wear resistance than a GL5 gear oil. The specification is MIL-PRF-2105E (aka J2360 after Jan 1, 2004). A good example would be the Amsoil Severe Service gear oil. Its listed at GL5, but it also conforms to MIL-PRF-2105E (aka J2360), so it has excellent compatibility with brass gearbox parts. Not sure how a syncro box would work with an oil like this though.

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Aug 26, 2008, 03:28 PM

#62

DRFTKNGG

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Add a little Lucus Oil Stabilizer to the mix and it gets even better!

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Aug 26, 2008, 05:46 PM

#63

Evolessfornow

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Quote:

Originally Posted by DRFTKNGG

Add a little Lucus Oil Stabilizer to the mix and it gets even better!

I hope that was sarcasm. Link

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Aug 26, 2008, 07:02 PM

#64

Lonnie@LMS

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We use Redline lightweight shockproof in the trans due to Shep's recommendations from his testing. We use Diaqueen in the t-case and rear diff. We used to use BG synchroshift II and had no issues with it to think of but changed cause Shep builds our customers tranny's.

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Aug 26, 2008, 07:44 PM

#65

C6C6CH3vo

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BG might work in well in Alaska, too thin here and made too much heat, for me in my climate MT90 for about 60,000 miles (changed about 6 times) seems to do the trick

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Aug 26, 2008, 09:51 PM

#66

mojo

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I just changed from MT-90 to Amsoil MTG. I also put Amsoil SVG in the transfer case and rear diff.

Shift is nice and smooth. I wasn't unhappy with the MT-90 but I like this better.

Oil Doc is great! Thanks Oil Doc

http://bestoil4you.com/Evo.html

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Aug 27, 2008, 12:33 PM

#67

Kracka

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Redline MTL/MT-90 mix for all my cars and I love it!

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Aug 28, 2008, 07:02 AM

#68

Davo

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^^^
2mt and 1 mtl or 2mtl and 1 mt?

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Aug 28, 2008, 07:17 AM

#69

nightwalker

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I have 120k miles and have always used Mitsu Diaqueen. Switched to BG II for 10k miles, and my transmission was pregressively getting notchier. Went back to Diaqueen and it fixed it. Never used anything else since then.

If you race, just change it out more frequently.