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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 05-09-2011, 06:35 PM
tblt44 tblt44 is offline
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What rear diff oil to use

2005 325i
The manual says 75w-90.It does not say synthetic or not.
I use Mobil 1 full synthetic in my trucks.Would this be ok for the 325i.
Or would a synthetic blend be better ?

Another question, do these cars have a posi or limited slip diff ?

thanks all
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  #2  
Old 05-09-2011, 07:12 PM
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Synthetic, for sure: less likely to break down over time and become acidic. I used Royal Purple (because the other favorite brand wasn't available) and it is doing well. And only the ///M cars come stock with LSDs.
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  #3  
Old 05-09-2011, 08:52 PM
oilsschmoils oilsschmoils is offline
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Redline 75W90.
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  #4  
Old 05-10-2011, 06:18 AM
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Originally Posted by oilsschmoils View Post
redline 75w90.
+1
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  #5  
Old 05-10-2011, 06:21 AM
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Quote:
Originally Posted by oilsschmoils View Post
redline 75w90.
1+
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  #6  
Old 05-10-2011, 07:54 AM
Nervous Nervous is offline
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Mobil1 75w-90
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  #7  
Old 05-10-2011, 07:58 AM
Kubs Kubs is offline
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I use Amsoil 75W90 rear gear oil. It works great and actually helped my fuel mileage.

http://www.amsoil.com/storefront/svg.aspx?zo=1934716

I also would recommend the hand pump that Amsoil sells

http://www.amsoil.com/storefront/g2039.aspx?zo=1934716

I changed my trans and diff oil in less than 1/2 hour. The pump makes filling the diff and trans so much easier.
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  #8  
Old 05-10-2011, 09:37 AM
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If the E46 is similar to the E39 (we share the M54 engine but I'm not sure about the differential), then this list may help:
- BMW E39 fluid summary printout for your glovebox (1)

Here's a related excerpt from post #16:

Quote:
- Differential (conventional, i.e., non-limited-slip E39s): The Bentleys specify "BMW SAF-XO synthetic final drive gear oil" which doesn't exist (it's Castrol). The Bentleys don't specify the weight (it's SAE 75W-90); and the Bentleys don't specify the quality (it's API GL-5 hypoid gear oil). Given that, suitable replacements are Amsoil Synthetic Manual Transmission Fluid (MTF) API 75W90,Mobil1, Royal Purple Max-Gear, & Redline SAE 75W90 API GL-5 synthetic gear oils. Unfortunately, there's no way to tell which of the three (3) different differentials you have w/o looking at the numbers molded into the metal. Bentley page 020-11 & 020-26 & 331-6. [Volume: Type G=1.7 quarts, Type 188 Compact=1.1 quarts, Type 220/215 Compact=1.5 quarts.] Replacement Interval: Lifetime fluid (but most recommend replacing differential fluid at the same time you replace transmission fluid, which is about 5 years or roughly 60K miles).
- Differential (limited-slip E39s, such as the M5): BMW SAF-XJ API GL-5 SAE 75W-140 synthetic hypoid final-drive gear oil (aka Castrol SAF-XJ). This requirement is not listed in the Bentley manual; it is gleaned from the Castrol literature and from what is stated about the M5 in this thread below (please correct if necessary). Replacement Interval: Lifetime fluid (but most recommend replacing differential fluid at the same time you replace transmission fluid, which is about 5 years or roughly 60K miles).

Last edited by bluebee; 05-10-2011 at 09:38 AM.
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  #9  
Old 05-10-2011, 09:40 AM
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Quote:
Originally Posted by oilsschmoils View Post
Redline 75W90.
One more +1
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  #10  
Old 05-10-2011, 10:24 AM
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Quote:
Originally Posted by oilsschmoils View Post
Redline 75W90.
I just poured this in my diff this past weekend.
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  #11  
Old 05-10-2011, 12:33 PM
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I use Redline 75w90
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  #12  
Old 05-10-2011, 02:35 PM
tblt44 tblt44 is offline
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Wow everyone uses redline.
I don't know if I have that local.
I do have royal purple and Mobil 1,I will have to look for redline
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  #13  
Old 05-10-2011, 02:41 PM
Nervous Nervous is offline
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You don't. Mobil1 is as good as any other synthetic GL-5 75w90 gear oil.
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  #14  
Old 05-10-2011, 02:47 PM
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I ordered redline tranny and diff fluids from Amazon
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  #15  
Old 05-10-2011, 04:51 PM
tblt44 tblt44 is offline
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Quote:
Originally Posted by Nervous View Post
You don't. Mobil1 is as good as any other synthetic GL-5 75w90 gear oil.
I use Mobile 1 gear oil and motor oil in my trucks,I just didn't know about theses cars.
I will probley go with Mobil 1 than.
I guess if I go with Mobil 1 engine oil I need to use 0w-40 also to meet a BMW approved oil.
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  #16  
Old 05-10-2011, 06:37 PM
jcourcoul jcourcoul is offline
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Quote:
Originally Posted by tblt44 View Post
I guess if I go with Mobil 1 engine oil I need to use 0w-40 also to meet a BMW approved oil.
Yes, if you read the fine print on the bottle you will see that it is BMW LL01 certified. I'm running with it now.

Worth noting, though. The Official Oil that the dealers use and sell over here is Castrol Syntec 5w40. Don't know if it is cause Mobil is a bit more fluid, but the engine has required about a pint to top up in the change interval, whereas with the Castrol it was not necessary. Over here, synthetics are extremely difficult to come by, BMW compatibles even more so, so those are the only two choices available.
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  #17  
Old 05-10-2011, 08:41 PM
oilsschmoils oilsschmoils is offline
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Quote:
Originally Posted by Nervous View Post
You don't. Mobil1 is as good as any other synthetic GL-5 75w90 gear oil.
Nope! One is a group IV PAO and one is a Group V POE, and that definitely isn't the same.
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  #18  
Old 05-10-2011, 08:53 PM
Nervous Nervous is offline
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Originally Posted by oilsschmoils View Post
Nope! One is a group IV PAO and one is a Group V POE, and that definitely isn't the same.
Links?
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  #19  
Old 05-11-2011, 01:38 AM
oilsschmoils oilsschmoils is offline
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Go to Mobil and Redline web sites.
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  #20  
Old 05-11-2011, 05:31 AM
Nervous Nervous is offline
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I did. No such info there. So, links?
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  #21  
Old 05-11-2011, 06:16 AM
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Here is a link to oils BMW says to use.

http://www.bmwusa.com/Standard/Conte...ngineOils.aspx

If you use Mobile 1 you should use the "European Car Formula 0W-40", (see attached picture).
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  #22  
Old 05-11-2011, 06:58 AM
Nervous Nervous is offline
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Now read the topic's title.
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  #23  
Old 05-11-2011, 07:08 AM
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Quote:
Originally Posted by Nervous View Post
Now read the topic's title.
tblt44

Quote:
Originally Posted by Nervous
You don't. Mobil1 is as good as any other synthetic GL-5 75w90 gear oil.

I use Mobile 1 gear oil and motor oil in my trucks,I just didn't know about theses cars.
I will probley go with Mobil 1 than.
I guess if I go with Mobil 1 engine oil I need to use 0w-40 also to meet a BMW approved oil.


Now read the rest of the thread...we got side tracked.
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  #24  
Old 05-11-2011, 07:12 AM
Nervous Nervous is offline
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Just quote the offtopic you are answering to.
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  #25  
Old 05-11-2011, 07:16 AM
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Quote:
Originally Posted by Nervous View Post
Just quote the offtopic you are answering to.
No
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