 » Site Navigation | | | | » Recent Threads | | | 1999 M3 Swap 09-07-2023 10:10 PM 05-02-2024 08:18 PM 6 Replies, 402,457 Views | |  |  |  |  05-02-2007, 04:09 PM | #1 | | Senior Member Join Date: Mar 2005 Location: NJ Posts: 1,625 |  Royal Purple Quest.
Royal Purple offers 3 different trans oils & so I'm kinda confused, I guess...
ATF Manual Transmission fluid
SynchroMax (for manual trans. which require for auto trans fluid??)
Max-Gear Synthethic Gear Oil 75W-90
1- Which one is the most ideal for our cars (manual trans - '99 ti)??
2- Could I use Synth gear oil 75W-90 in the gearbox, as added protection, or would that be an overkill with possible additional ramifications??
thx! |  |  | | 05-02-2007, 05:00 PM | #2 | | Senior Member Join Date: Aug 2005 Location: Florida Posts: 2,525 |
I run Redline MTL 75-90. No problems. I would actually say the transmission is a lot quiter and shifts smoother than it did with BMW labeled transmission fluid. | | | | | 05-02-2007, 05:10 PM | #3 | | doesn't care about you. Join Date: Aug 2004 Location: Denver, CO Posts: 3,925 |
Quote: Originally Posted by marko  Royal Purple offers 3 different trans oils & so I'm kinda confused, I guess...
ATF Manual Transmission fluid
SynchroMax (for manual trans. which require for auto trans fluid??)
Max-Gear Synthethic Gear Oil 75W-90
1- Which one is the most ideal for our cars (manual trans - '99 ti)??
2- Could I use Synth gear oil 75W-90 in the gearbox, as added protection, or would that be an overkill with possible additional ramifications??
thx! | I use Royal Purple SynchroMax in the manual transmission gear box. I use Royal Purple Max-Gear Synthetic Gear Oil 75w90 in the differential (no additional additives needed for LSD. __________________ 
'99 Dinan M3 | | | | | 05-02-2007, 06:08 PM | #4 | | Senior Member Join Date: Aug 2005 Location: Florida Posts: 2,525 |
Just to clarify my post as it could be confusing the 75/90 I run in my transmission is transmission lube. I don't think running 75/90 gear lube in your transmission is a good idea but I don't really know that for sure. I do know that 75/90 transmission oil has a much different smell, appearance, and consistency that 75/90 gear oil. Gear oil smells like crap. | | | | | 05-02-2007, 10:37 PM | #5 | | Senior Member Join Date: Aug 2004 Location: state college, pa Posts: 3,431 |
Quote: Originally Posted by mohaughn Gear oil smells like crap. | Sulfur additives (friction modifiers) make it smell like rotten eggs. Wear disposable gloves! __________________
I scream, you scream, we all scream for ZOMBIES. | | | | | 05-03-2007, 01:03 PM | #6 | | Senior Member Join Date: Mar 2005 Location: NJ Posts: 1,625 |
nice.. thx all! | | | | | 06-13-2007, 06:11 PM | #7 | | Senior Member Join Date: Jun 2007 Location: back in PA Posts: 204 |
X2 for the Synchromax in manual tranny (use it in my other BMW)
I use either Redline 75W/90 or Amsoil Severe Gear 75W/90 in the rear diff. | | | | |
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