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Old 04-16-2011, 08:51 AM   #1
01tj
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diff and tranny fluid

Getting ready to change the diff and tranny fluid in my 330i and I was wandering if there are any types that are better than others. When I changed the transmission fluid in my Jeep I used Redline and there was a noticeable improvement in shifting smoothness. The clutch just seemed to work better.
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Old 04-16-2011, 09:13 AM   #2
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I use royal purple for my manual and diff. BTW Search first.
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Old 04-16-2011, 09:17 AM   #3
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You can change the tranny and dif fluid?

I don't have any caps for that under my hood.

I'll search and let you know; seems like someone would have tried that if it's possible and might have written something about it.
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Old 04-16-2011, 09:22 AM   #4
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OP...

Sorry, I was making fun of you in case you didn't know. You need to spend more time here is the kind of fluid you should get.

You'll hear OE (yes, you can get it), RL MTL for manny trans, D4ATF for manny trans, a mix of the two in different ratios. You'll hear Pentosin is OE, that LubroMoly makes nice fluids, that RP not so much in either diff or trans...I forget.

You have to read a lot and decide. More important though to change it before finding the perfect fluid...you would die before finishing reading all the thoughts fanatics have had over the years about trans/dif fluids.

What's funny, though, is that no one ever asks about oil; just trans/dif fluid.
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Old 04-16-2011, 09:28 AM   #5
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manual or automatic? How many miles? If its automatic, dont bother....check the threads on here and they will confirm- you will possibly get a transmission failure shortly after the procedure. It may be possible to drop the pan, replace the filter, and add new fluid, but you should not by any means provide any type of fluid flush.

I am not too sure about the differential fluid procedure...never done either one and I am at 108K miles.

If you have an automatic ZF 5HP19 transmission, be sure to use the factory recommended fluid- Esso LT71141, otherwise you can face a possible transmission failure.

Here's a DIY I have consulted before-

http://www.bimmerfest.com/forums/sho...d.php?t=166135

But I'd still check with the other threads on this board.
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Old 04-16-2011, 09:30 AM   #6
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Quote:
Originally Posted by dmax View Post
OP...

Sorry, I was making fun of you in case you didn't know.
Thanks but I kind of figured that out and was also expecting it lol

Quote:
Originally Posted by dmax View Post

You need to spend more time here is the kind of fluid you should get.

You'll hear OE (yes, you can get it), RL MTL for manny trans, D4ATF for manny trans, a mix of the two in different ratios. You'll hear Pentosin is OE, that LubroMoly makes nice fluids, that RP not so much in either diff or trans...I forget.
That's the biggest problem with the search. It usually turns up thousands of results and out of those only a handful are useful.

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Originally Posted by dmax View Post

You have to read a lot and decide. More important though to change it before finding the perfect fluid...you would die before finishing reading all the thoughts fanatics have had over the years about trans/dif fluids.

What's funny, though, is that no one ever asks about oil; just trans/dif fluid.

That's this was actually a pretty helpful post
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Old 04-16-2011, 09:40 AM   #7
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Originally Posted by 01tj View Post
Getting ready to change the diff and tranny fluid in my 330i and I was wandering if there are any types that are better than others. When I changed the transmission fluid in my Jeep I used Redline and there was a noticeable improvement in shifting smoothness. The clutch just seemed to work better.
I used RedLine MTL for my manual and Mobile 1 gear oil for the diff.
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Old 04-17-2011, 10:20 PM   #8
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I used Red Line MTL just yesterday (the fill plug was PITA but finally got it this time around) and found immediate results. Much smoother shifts, although I wonder how long it will last as many people have found that after 5K + mi it returns to normal.

I also purchased Red Line gear oil and planned on doing it at the same time. However, I do not have the needed hex socket so I'm actually on the hunt for one as we speak. Anyone know what size hex for the fill/drain plugs?
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Old 07-06-2011, 06:03 AM   #9
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Originally Posted by WheyArea View Post
I used Red Line MTL just yesterday (the fill plug was PITA but finally got it this time around) and found immediate results. Much smoother shifts, although I wonder how long it will last as many people have found that after 5K + mi it returns to normal.

I also purchased Red Line gear oil and planned on doing it at the same time. However, I do not have the needed hex socket so I'm actually on the hunt for one as we speak. Anyone know what size hex for the fill/drain plugs?
I believe its 14mm
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Old 07-06-2011, 09:04 AM   #10
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I've been using Mobil 1 75W 90 for both my diff and tranny for the last 12 years and 326,000 miles without issues. Just my two and a half cents worth...
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Old 07-06-2011, 09:39 AM   #11
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I've been using Mobil 1 75W 90 for both my diff and tranny for the last 12 years and 326,000 miles without issues. Just my two and a half cents worth...
Zach, I'm curious what your thoughts would be on the 75/90 in a manual trans around NJ? I got fresh OE fluids when I did them last a couple of years ago, so should be good for years, but I'm also thinking of losing these pricey fluids in favor of changing it more often. How often do you change your fluids down there?

I had used RL 75/90 in diff and MTL in the trans...(I don't know what RL MTL might be in weights, nor what the OE fluid's weight might be...too lazy to search...it's down a bit on my list of things to do!)
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