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Old 10-18-2003, 11:32 AM   #1
makofoto
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Join Date: Sep 2002
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Location: South Pasadena, CA
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2006 Legacy Outback
Blue

Smile MT-90 - OEM MT Oil Mix experiment, good ...

I was finally able to suck out 1.5 quarts of my OEM MT oil (probably Valvoline 75/90) and replace it with 1.5 qt.s of Redline MT-90 (what I happen to have left from when I was using 100% MT-90).

The inexpensive FloTool siphon pump that I bought at Kragen Auto Parts was not quite strong enough to allow me to pump out the oil ... someone recommended this tool ... perhaps I wasn't doing something correct.

So I bought a $8 fluids pump from the Auto Section of my hardware store ... along with about 5 feet of 1/4 clear plastic tubing. The 1/4 tubing fit INSIDE the bottom of the pump ... which has a nipple for the 1/4" to go over ...

At first it wasn't working ... until I realized that I had the tubing too far into the gearbox/differential. Check how long the dip stick is ... you just need to go a bit further in.

This pump worked well ... squirting the oil out in 1 oz. spurts.

So with a 2 qt. OEM oil/ 1.5 qt.s MT-90 ... mix .... I've largely gotten rid of the knashing of gears when I do quick first to second up shifts ... I can STILL beat the syncros with my shortened shift lever ... but I don't have to do that pregnant pause while shifting off the line. And 2nd to 1st down shifts are easier ... even without double clutching ... which I usually do anyway. Without the MT90 ... even at a standstill I could crunch going from second to first.

I don't think this mixture is quite as good as 100% MT-90 ... for fast shifts ... but this might be a good compromise between a GL-4 and GL-5 lube. Decent high pressure lube qualities for gear life ... and better syncro action from the better friction coefficient ...
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Old 10-18-2003, 11:34 AM   #2
makofoto
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Old 10-18-2003, 11:38 AM   #3
makofoto
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NOTE: That the label says that MT-90 is NOT Recommended for use in a rear-wheel differential ... which requires a GL-5 lubricant. So you have to imagine the same goes for a front differential requiring GL-5 Lube ... which is what our WRX manuals state is required for our cars.

NOTE: That COBB Tuning "recommends" MT-90 for our cars ... of course they aren't necessarily worried about the longevity of our differentials ...

SEE Tech Article of Transmission Oils down on this page:

http://cobbtuning.com/tech/index.html


Last edited by makofoto; 10-18-2003 at 11:44 AM.
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Old 10-18-2003, 10:28 PM   #4
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Why mess with it anymore?
I've run Redline 75w90ns in the tranny for about 3 years now. Got tired of the notchyness that started recently, 85k miles, and threw some Royal Purple Maxgear (75w90) into the tranny..
One word: Amazing

I should have done this 3 years ago.

GL-4 and GL-5 so it won't corrode the syncros.
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Old 10-20-2003, 02:29 AM   #5
makofoto
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bump ... for the readers of this closed thread: http://forums.nasioc.com/forums/show...hreadid=416514

"Gear oils info (long)"
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