Royal Purple for the Diff ?

johnclarke · Thu, Apr-03-2008, 09:18:20 PM

After reading through the other threads, I'm going to RP synchromax in my SMG. Now for the (brace yourself) for the dumb question. Is the Diff product "Max-Gear" and is it recommended vs. OEM fluid? How many quarts do I need ? Yes, I'm too lazy to look it up, so go ahead and tell me to rtm.

Bents · Thu, Apr-03-2008, 09:26:11 PM

Personally I stick with OEM in the diff. It's a very specific design and I feel as if BMW knows best on this one.

Oh and

M3-peat · Thu, Apr-03-2008, 09:43:28 PM

Quote:

Originally Posted by johnclarke

After reading through the other threads, I'm going to RP synchromax in my SMG. Now for the (brace yourself) for the dumb question. Is the Diff product "Max-Gear" and is it recommended vs. OEM fluid? How many quarts do I need ? Yes, I'm too lazy to look it up, so go ahead and tell me to rtm.

I have it in my diff as well as tranny. Tranny fluid has been in for 40k miles and diff fluid for 12-15k miles. No noises, runs fine.

If you go the RP route, there are two RP diff fluids, make sure to get the right one. I found it by searching here (pretty sure it's max gear though).

**jon @ eas** · Thu, Apr-03-2008, 09:57:21 PM

Nothing wrong with Royal Purple... But I don't put it in my BMW... I save it for my Camaro!

The BMW, I just put the OEM fluid in...

johnclarke · Fri, Apr-04-2008, 01:39:19 AM

Well...I finally got off my virtual ass and read every post on Royal Purple. Obviously this has been hotly debated and I will self terminate my thread. Ok, and if my diff blows when I go to RP.....I'll let everyone know

///m1ka · Fri, Apr-04-2008, 01:43:01 AM

Quote:

Originally Posted by johnclarke

Well...I finally got off my virtual ass and read every post on Royal Purple. Obviously this has been hotly debated and I will self terminate my thread. Ok, and if my diff blows when I go to RP.....I'll let everyone know

Why wouldn't you just use OEM.

OEM = no problems

After market fluids = big gamble to save a few dollars.

I purchased 3 sealed / new bottles of OEM diff fluid on ebay for $63 shipped opposed to ~$140 at the stealer.

Carnag3 · Fri, Apr-04-2008, 02:26:39 AM

THE RP for the tranny works nicely. I guess it doesn't work the same for the diff.

johnclarke · Thu, Apr-17-2008, 05:59:25 PM

I ended up going with OEM at $33.00 a quart from the stealer, so thanks for the advice. On the bright side my indy charged me $120.00 to do the seal, vs. $440.00 stealer. Pirates I tell ya.

brahl · Thu, Aug-28-2008, 02:36:55 AM

[QUOTE=///m1ka;2898863]
After market fluids = big gamble to save a few dollars.[QUOTE]

I disagree. For example, look at the motor oil that is absolutely recommended for the M3 - it is made by Castrol, an aftermarket brand, rather than BMW motor oil.

- Brian

mrtt · Thu, Aug-28-2008, 03:28:05 AM

I replaced tranny fluid w/ RP synchromax. Smooth as butter.

Thu, Apr-03-2008, 09:18:20 PM	#1
johnclarke Registered User Join Date: Sep 2007 Posts: 560 Reputation: 0	Royal Purple for the Diff ? After reading through the other threads, I'm going to RP synchromax in my SMG. Now for the (brace yourself) for the dumb question. Is the Diff product "Max-Gear" and is it recommended vs. OEM fluid? How many quarts do I need ? Yes, I'm too lazy to look it up, so go ahead and tell me to rtm. __________________

Thu, Apr-03-2008, 09:57:21 PM	#4
jon @ eas M3Forum Sponsor Join Date: Mar 2008 Posts: 3,299 Reputation: 0	Nothing wrong with Royal Purple... But I don't put it in my BMW... I save it for my Camaro! The BMW, I just put the OEM fluid in... __________________ Jon M. \| european auto source (eas) email: jon@europeanautosource.com web: www.europeanautosource.com tel 866.669.0705 \| ca: 714.369.8524 x31 \| fax: 714.908.1796 Twitter \| Flikr \| Facebook \| YouTube

Fri, Apr-04-2008, 01:39:19 AM	#5
johnclarke Registered User Join Date: Sep 2007 Posts: 560 Reputation: 0	Well...I finally got off my virtual ass and read every post on Royal Purple. Obviously this has been hotly debated and I will self terminate my thread. Ok, and if my diff blows when I go to RP.....I'll let everyone know __________________

Thu, Apr-17-2008, 05:59:25 PM	#8
johnclarke Registered User Join Date: Sep 2007 Posts: 560 Reputation: 0	I ended up going with OEM at $33.00 a quart from the stealer, so thanks for the advice. On the bright side my indy charged me $120.00 to do the seal, vs. $440.00 stealer. Pirates I tell ya. __________________

Thu, Aug-28-2008, 02:36:55 AM	#9
brahl Registered User Join Date: Jul 2008 Age: 29 Posts: 124 Reputation: 0 Location: Sheppard Air Force Base	[QUOTE=///m1ka;2898863] After market fluids = big gamble to save a few dollars.[QUOTE] I disagree. For example, look at the motor oil that is absolutely recommended for the M3 - it is made by Castrol, an aftermarket brand, rather than BMW motor oil. - Brian __________________ 2001 BMW ///M3 Coupe

Thu, Apr-03-2008, 09:26:11 PM	#2
Bents Registered User Join Date: Nov 2006 Posts: 20,555 Reputation: 0 Location: Obamaville	Personally I stick with OEM in the diff. It's a very specific design and I feel as if BMW knows best on this one. Oh and

Fri, Apr-04-2008, 02:26:39 AM	#7
Carnag3 WKS Join Date: Feb 2008 Age: 29 Posts: 1,122 Reputation: 0 Location: Falls Church, Va	THE RP for the tranny works nicely. I guess it doesn't work the same for the diff.

Thu, Aug-28-2008, 03:28:05 AM	#10
mrtt Registered User Join Date: Jul 2007 Posts: 843 Reputation: 0 Location: Seattle	I replaced tranny fluid w/ RP synchromax. Smooth as butter.

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