90W question
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90W question
So i have been thinking about changing my 90w in my tranny and rear end. Wondering what brand has people used and would recommend. I thought about royal purple but the price is pretty stiff..
Thanks for any input.
Thanks for any input.
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in the trans i like a 50/50 mix of atf and 75/90. i've tried all the synthetics, the 50/50 mix shifts just as well, if not better.
in the rear i like redline 75-90, shockproof if the car see's the track.
in the rear i like redline 75-90, shockproof if the car see's the track.
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I use Redline MT-90 in the Transmission and Redline 75W140 gear oil in the differential.
Extremely smooth shifting after a couple minutes of warm up. However, my transmission and differential have both been rebuilt in the previous 3k miles so everything inside is pretty new and your mileage may vary.
Extremely smooth shifting after a couple minutes of warm up. However, my transmission and differential have both been rebuilt in the previous 3k miles so everything inside is pretty new and your mileage may vary.
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#10
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For the trans be sure to buy something that is brass / yellow metal compliant. As the synchros are made of brass and the newer high sulfur gear oils will corrode the brass. It needs to be GL-4 spec. Almost everything you'll find at the local auto parts store is wrong. Including the Royal Purples; there are tales of Rx-8 owners switching to Royal Purple trans gear oil then it shifts notchy. If it's MT-1 spec don't buy it. API Category MT-1 designates lubricants intended for non-synchronized manual transmissions used in buses and heavy-duty trucks.
MT-90 if you have $ or Sta-Lube 85w90 from Napa Auto Parts. The Sta-Lube can also be used in the diff and is $34/gallon, enough to do both the trans and diff. It's thick and quieter than the cheapo stuff, and shifts wonderfully once warmed up.
MT-90 if you have $ or Sta-Lube 85w90 from Napa Auto Parts. The Sta-Lube can also be used in the diff and is $34/gallon, enough to do both the trans and diff. It's thick and quieter than the cheapo stuff, and shifts wonderfully once warmed up.
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