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simple manual transmission question

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Old Apr 16, 2009 | 02:30 PM
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Default simple manual transmission question

I know its in the manual but can someone tell me what type of transmission fluid to use in my 98 6 speed.
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Old Apr 16, 2009 | 02:42 PM
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Dexron ATF
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Old Apr 16, 2009 | 03:00 PM
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You might want to consider using synthetic ATF, like Amsoil universal ATF - better than the factory stuff and because you don't need to change it very often, the cost is insignificant. Don't forget the diff fluid as well.
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Old Apr 16, 2009 | 03:01 PM
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Or if you want to use a synthetic, use Amsoil ATD (or their universal ATF). DO NOT use Mobil 1 ATF, it is NOT compatable with your paper blocker rings.

All C5's before 2001 had paper blocker rings.
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Old Apr 16, 2009 | 03:05 PM
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I've had good luck with Royal Purple Synchromax- 98 M6 with 145k miles.
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Old Apr 16, 2009 | 03:15 PM
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what diff fluid do i use,,,,,,
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Old Apr 16, 2009 | 11:12 PM
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Originally Posted by rocco666
what diff fluid do i use,,,,,,
75 W 90(or 95) I used royal Purple in tranny and diff. RP syncro max in tranny,,Rp Max gear in rear. About 13,000 later still happy. The Max gear has the posi additive in it,,no need to add it!!
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Old Apr 16, 2009 | 11:24 PM
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I use RP 75w-90 in the diff - it has the additive already in it for the limited slip. I use RP Synchromax in the trans. Great stuff. Amsoil makes great products too.
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Old Apr 17, 2009 | 03:20 AM
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Default tranny and diff fluid

Any dextron III ATF will do for the tranny. Although, I had a hard time finding Dextron III when I replaced mine at 65K miles. I guess Dextron III is no longer a spec. The stock fluid was still red when I dumped it. I replaced it with Castrol Domestic Multi vehicle ATF ($3 per quart) with no problems.

I also replaced my diff with Mobil 1, 75W-90 LS synthetic. Any Synthetic 75w-90 will work. Also, add limited slip additive.

Good luck
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