Royal purple Gear Oil's

[Jayken]

Hi Guys , Is it ok to use Royal purple instead of Redline gear oil in the front and the back end?
because the Redline 75/140 is hard to find in my area.
thanks

[philbytx]

Mobil1 75w140 is available pretty much everywhere and works just as well
One note.....75w90 is the recommended FD lube and there has been a lot of discussion concerning the FD problems and associated use of 75w140 in the FD.
Note that 75w140 is BMW recommended for the GB. I use Mobil1 75w140 in both bikes GB's and 75w90 Mobil1 in the FD's, have done so for years.

[dmk]

Does anyone know if/when BMW Gear Oil 80w90 GL5 is suggested for the transmission or FD? I just changed both with it and want to make sure I'm ok.

[philbytx]

No problem with 85w90....it's GL5 and the correct spec. Synthetic generally has a wider viscosity spread (75w90 and 75w140).
If you have shifting issues with your GB then try 75w140 in it. Especially if you are in a hot climate.

Does anyone know if/when BMW Gear Oil 80w90 GL5 is suggested for the transmission or FD? I just changed both with it and want to make sure I'm ok.

[Jayken]

I went ahead and used the Royal purple gear oils, 75W140 for the FD and 75W90 for the rear .
It made a large difference in my shifting, now the bike shift's smooth.