Royal Purple Trans/Gear oil

[Heine]

I used Royal Purple Synchromax in my E39 540-6 & was happy with it.
I get conflicting input on their transmission oils for my E34///M5.
One rep states to use Synchromax for transmission & Gearmax 75w90 for differential.Another states Gearmax 75w90 for both.

In Roundel Mike Miller dismisses the product,because the name reminds him of a candy or drink from the old fasioned soda fountain shop.

What is the right RP product for this application.

Regards
Heine
'91///M5 Blk/Blk Coming out of winter storage.

[Prairieman]

that depends on what viscosity oil is prescribed for the E34 M5 5-speed gearbox. My M5 has the Getrag 280 6-speed which calls out ATF as the proper lubricant. Poyal Purple specifies their synchromax product for manual gearboxes using ATF.

I thoroughly Mike Miller's column, but disagree with his assessment of Royal Purple products. I'm a happy customer..

Brad
1979 635CSi
1981 745i
1991 M5
1992 735i

[cchase009]

If you can't find Royal Purple...look @ BG SynchroShift II for the box and BG 75/90 with LSII for the diff.

C. Chase
'91 M5