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01-25-2016, 11:15 PM | #1 |
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Z4M transmission fluids
I know this subject had been discussed a gazillion times, but I would greatly appreciate your updated views/opinions on the matter after "living" with it over the years. Thanks.
1. What fluid did you select? 2. What was your reason for selecting it? 3. How well/consistent did it performed throughout it's service life? 4. Would you select the same fluid again? |
01-26-2016, 07:21 AM | #2 |
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RP synchromax.
I've been using it for five years now and about 20k miles It has stood up well. I'll be changing it this year and will use the same again. Generally smoother shifting than the OE fluid. Old RP discussion here... http://www.zpost.com/forums/showthread.php?t=626963 I should add, that I have experienced other mt cars that were VERY sensitive to the type of oil used. The worst was a G35 that I changed to Redline. Soon as I got out of the driveway I knew it wasn't going to work. Swapped the OE fluids back right away.
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01-26-2016, 10:36 AM | #4 | |
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I've seen that old RP thread - just wanted to see/hear some long term opinions on it as some say it may not hold up long term. |
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01-27-2016, 03:59 AM | #6 |
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stock.... more than happy with this.
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01-28-2016, 10:17 AM | #7 | |
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If I recalled, I used 2L of the transmission fluid on my last change - not sure how much I had left over if any. Will 2Q (bottles) of the RP synchromax be enough? I'm not that much in love with the stock fluid. It's OK, but I not as smooth as I would like. |
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01-28-2016, 10:36 AM | #8 | |
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01-28-2016, 11:00 AM | #9 |
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I can't offer any firsthand experience with longterm use, yet, but I researched this a lot. I don't know that I ever saw a negative comment regarding Royal Purple Synchromax. I think I saw one neutral comment that it was no better than stock, but never a negative comment. The majority said RP was excellent and offered better shifting characteristics over stock. It was what I had planned to use in my transmission. My Z4MR had original fluid at 30K, and my transmission was notchy and sometimes denied a 3rd to 4th shift at lower RPMs.
I now have Redline D4 in my trans. Just replaced. It's what my mechanic prefers. It is smooth right now, but I also did other work (VT engine mounts, Rogue trans mounts, CDV delete, and I have a weighted shift knob). It is like a different car, now. I know a lot of folks run Redline MTL and some a 50/50 split of Redline D4 and MTL. MTL is thicker. So, I'll report back when I've put 10-15K on this Redline D4. A few anecdotal stories are that Redline is excellent at first but shifting isn't as good after it has substantial miles on it. I may try RP in 15K miles if the Redline D4 degrades just to see if I can tell a difference. Salty
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01-28-2016, 11:59 AM | #10 |
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My Z4MC sees a lot of HPDS track time so I use a 50/50 blend of Red Line MTL and MT90 with an OCI of every other year.
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01-28-2016, 01:46 PM | #11 |
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I need to change my transmission (and diff) fluid soon for the first time. I have no complaints with how the car shifts - that being the case I was going to go with OE fluid. Is there any other compelling reason to change to RP?
Thanks!
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01-28-2016, 03:28 PM | #12 | |
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2 qts. is enough. I think the trans officially holds 1.5 L. I'm pretty sure that last time I looked the OEM trans fluid only came in a big honkin' jug. RP comes in quarts cheap from AutoZone, so for me it was mostly convenience. I stick with the OEM diff fluid.
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01-28-2016, 04:35 PM | #13 | |
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Thanks all for the excellent feedbacks |
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02-06-2016, 01:06 AM | #14 |
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Oh, if you're going to change the trans and diff fluid, you can never have too many shampoo pumps.
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02-06-2016, 07:46 AM | #15 | |
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I have a pump fluid extractor that I bought for topside in-between service oil changes. But, my india buys fluids in bulk, and I found out that he can do oil changes for cheaper than I can buy just the oil. Salty
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02-06-2016, 11:50 PM | #16 |
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I bought 3, so I don't have to worry about cleaning them.
One for extracting brake fluid from the reservoir for a fluid flush, one to fill the trans, one to fill the diff.
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02-22-2016, 10:46 PM | #17 |
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I used to get the OEM MTF-LT2/3 but it's such a pain to source so recently switched to Redline and haven't noticed any difference.
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02-23-2016, 12:05 AM | #18 |
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Can't you buy the OE fluid from your local dealer? I only ask because that is what I plan to do...Thanks!
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02-23-2016, 06:07 AM | #19 |
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Dunno about now but before they only used to sell in large volumes that would be of no use to me (like 2-3 flushes worth)
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02-23-2016, 09:06 AM | #20 |
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03-28-2016, 02:22 AM | #21 |
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Thank you all for your feedback. Changed out the transmission fluid today. Decided to go with RP synchromax from all the positive feedback here - WOW, what a difference! The 2nd gear notchy-ness/grind I had previously is gone now (just from my first drive after the change today). Gear changes are "buttah" smooth now - couldn't be happier with it
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03-28-2016, 09:30 AM | #22 |
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I changed the mtf and diff fluid at the same time when I took possession of the vehicle and didn't know the previous owners maintenance schedules. I used the bmw oem mtf in which I brought a container to the bmw dealer and they filled it for me. No problem with that and they were willing to help out. The diff. fluid is oem also because I read it could chatter around corners without having the proprietary friction material it was designed to have in it so aftermarket diff. fluid was ruled out. So I purchased a kit from ECS Tuning. All aluminum plugs changed out as well since I read they are a one time use. No issues. Seasonal driving here in Chicago, Illinois.
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