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04-03-2016, 08:32 AM | #23 |
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I've used factory fluids for the transmission and differential and it's worked out fine. Car used to see a lot of track time for about 6 years and sits at 90K miles on the odo. now.
diffsonline.com sells the OE diff fluid in single use quantities. |
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04-03-2016, 12:38 PM | #24 |
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I swapped out the OE fluid for Syncromesh a little while back. It came at the recommendation of my SA who was also a track rat. I didn't find a lot on it wrt Bimmer forums but what little I found was not bad. I didn't notice much of an improvement and will be open to swapping it out for something of a more known quantity in the future.
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04-03-2016, 02:06 PM | #25 | |
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RP Synchromax made a world of difference on mine. I have hated 2nd gear from day 1. It had a grinding feeling from the shift lever about 50% of the time if I shift below 4K with the OE fluid. It felt the same after swapping out the OE fluid at around 23K with Pentosin MTF2. The Synchromax, on the other hand, felt awesome after replacing the Pentosin at ~44K. I don't have to role the dice or cringe on every 2nd gear shift anymore and it's so much more enjoyable to drive it now |
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04-07-2016, 12:16 AM | #26 | |
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I swapped the trans fluid out about 4k miles ago. The car is waiting for the threats of snow to stop so it can hit the streets again. I'll re-eval once that happens. Morning commute temps are good enough these days (low 40's) where I'd be comfortable driving on summer tires. Need to get this layer of sawdust off first, though......my fault for not covering the car while using the garage to cut all the baseboard/quarter round when I replaced it all on the 1st floor... Oh....looks like I finally need a new battery, too......not bad for 9.5 years.
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09-16-2016, 08:24 AM | #27 |
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I just replaced the gearbox and diff fluids with Redline (MTL/MT90 mix and 75W140). I now detect a soft "chunking" noise from the rear when negotiating highway on and off ramps, which wasn't there before the change. My understanding is the the Redline fluid includes friction modifiers, so my question is - is this likely to go away with further use, or should I change back to OEM?
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2006 Z4M roadster. Interlagos Blue, black extended leather with carbon trim. Apex EC7 8.5/9.5 x 18 rims, Strong Strut brace, KW V3s with RE rear shock mounts, Vibra Tech and Rogue engine/transmission mounts, Stromung exhaust, CDV delete.
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09-16-2016, 10:20 AM | #28 |
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Our diff is so finicky with fluids - that's why I don't like to veer away from it unless there's a major reason to do so.
I think only you can decides if it bugs you enough to have the fluid changed. My understanding is that the slight groaning during sharp turns is "OK" |
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09-16-2016, 04:25 PM | #30 |
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Enthusiast Auto replaced my transmission fluid with Redline MTL and my diff is listed as 75W90 (I believe from BMW) with 505-7478 Diff Fluid Additive - added for limited slip
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10-16-2016, 03:42 PM | #33 | |
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2006 Z4M roadster. Interlagos Blue, black extended leather with carbon trim. Apex EC7 8.5/9.5 x 18 rims, Strong Strut brace, KW V3s with RE rear shock mounts, Vibra Tech and Rogue engine/transmission mounts, Stromung exhaust, CDV delete.
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10-16-2016, 04:39 PM | #34 | |
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2006 Z4MC - #LL93158
SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM |
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10-16-2016, 04:48 PM | #35 |
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I've had RP in the transmission for about 7 years now. IIRC I've swapped it out twice.
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2006 Z4MC - #LL93158
SS Race Cans, RE X Pipe, DKF Sec 1, Fabspeed Headers, OE STB, AS Shifter, Dave Z CDV, GC Coil Overs, Stoptech lines, Hawk DTC Pads, RE Clutch Stop, RE Transmission Mounts, Vibra-Technics Engine Mounts, Poly FCAB & RTAB, LeatherZ M Shift Boot, Tekarbon Rear Spoiler, CF Grills, Advan RS DGM |
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10-16-2016, 05:19 PM | #36 |
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