I have a 96' R1100R
I have been told by my BMW dealer that I can run 75w-140 synthetic oil in the tranny and final drive, and I guess you could run anything in it if you want to put it in.
My rig has 50k and has only had 80w-90 in it. Now, I have been under the assumption that putting synthetic in a rig that the book says should have 80w-90 in it, is wrong. This will eventually ruin the seals??? Does anyone have a rider report with lots of miles running synthetic in a rig that has 80w-90 as a stock oil?
Thanks in advance.