Which Transmisson Oil?

[srninjastar]

im getting my wrx within in next 2 or so weeks and it has roughly 50k miles on it. im gona replace the tranny and engine fluid with royal purple. would any of you guys suggest a better fluid than that?

[SuBeast]

me personally have fallen in love with Royal Purp after feeling the effects in a couple other cars... And those were just motor oil... Not the Gear, Tranny oil..

[0fourSTI]

i run royal purple all around, i just changed my diff and tranny with the royal purple 75w 90, and i noticed a big difference. the royal purple is gl 5 certified and contains the friction modifier for the lsd. my clutch just started to slipping tonite anyone any here do there own clutch. whats the best way ta do it and how hard is it thanx

[WRX2004]

Has anybody used Amsoil tranny and gear Lube? I know it's expensive but is supposed to be great stuff.

[Str8FrmDaCho]

alright im sorry to burst your guys bubble but redline mt-90 is *bad* that oil is too thick and will clog your oil lines if you run it for too long! talk to any tranny specialist and they'll tell you the same thing i know all you guys wanna be on the winning team but its definitly not redline

EDIT: Please try to be respectful of others. With that in mind, watch your... expressions... as well as your spelling/grammar. 'im' 'definitly' in favor of Capitalization every now and then as well. Perhaps some apostrophes and periods too?

-mosc

[WRXforME]

I read the op's post and nothing else...

I wouldnt use Royal Purple gear oil ever again. I used it in my tranny and my tranny shop believes its the cause of me blowing my tranny. Something about its not thick enough and started to seize bearings. Ive heard a lot of good things about Amsoil and the Uncle Scotty's Cocktail.

Just my .02

[zmanoside]

I'm gonna use ALL SUBARU recommended OEM fluids!!!

[Fidrat]

Originally Posted by Str8FrmDaCho

alright im sorry to burst your guys bubble but redline mt-90 is *bad* that oil is too thick and will clog your oil lines if you run it for too long! talk to any tranny specialist and they'll tell you the same thing i know all you guys wanna be on the winning team but its definitly not redline

EDIT: Please try to be respectful of others. With that in mind, watch your... expressions... as well as your spelling/grammar. 'im' 'definitly' in favor of Capitalization every now and then as well. Perhaps some apostrophes and periods too?

-mosc

That's why we use Redline 75-90ns and not MT-90 duh.

[man show]

Agreed. Red Line is a very good brand of oil. If you guys would just do a little research, you would see that 75W90-NS is the correct oil to use in the WRX's manual transmission and 70W-90 is the correct oil to use in the WRX's rear differential. I have been very satisfied using this exact combination in my own car for 18,000 miles now.

This information is taken directly from Red Line's website (www.redlineoil.com):

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Synthetic Gear Oils

Designed to provide the highest degree of protection and greatest efficiency for your drivetrain. Red Line provides a complete line of drivetrain lubricants which are optimized for differential, transmission, or transaxle use over a wide range of temperatures. Proper selection depends upon the manufacturers' requirements and whether the application is for passenger automotive, commercial, or racing use. Red Line Gear Oils contain polyol ester basestocks to provide excellent lubrication even under extreme conditions of high-loading and high-temperatures--their natural lubricity provide excellent slipperiness which reduces the sliding friction in hypoid gears to reduce wear and temperatures. The synthetic basestocks have a natural multigrade property, so large amounts of unstable thickeners are not required to manufacture our gear oils, which means that Red Line Gear Oils will provide a stable viscosity for even extended periods of use. Red Line also manufactures gear oils which can be used in limited-slip differentials without the use of additional friction modifiers.

75W90 NS

This GL-5-type gear oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.

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This information was actually already referenced in Post #15 of this thread by jwtarbaj. I'm just re-posting it to emphasize that Red Line (among others) is a quality brand of oil that is suitable for use in our cars.