Join Date: May 2011
Location: Edmonton, Alberta, Canada
Re: synthetic vs dino (if it bugs you...don't open)
Well, I can tell you what I have experienced first hand, both on the LT and on a Yamaha FJR1300.
Both machines experienced no problem whatsoever running Synthetic in the engine. Both machines have a problem running synthetic in the transmission/final drive.
When I first bought the FJR used, the original owner had warned me that he found synthetic weeped past the seal on the final drive. I stuck to Dino oil and had no problems, but the service shop I take it to had a new guy there that missed the note that said dino only in the final drive. I got the bike home and could see it starting to slowly weap past the seal. Took it back, cleaned it up real good, changed back to dino oil, no more problem.
The Output shaft seal on the LT needed to be replaced. As per BMW's instructions, they put the recommended synthetic in the transmission. Three days later the clutch was contaminated again. Tore the bike apart, inspected the seal, flushed the system, changed the clutch, put dino oil back in, and 7000 km's later I've had no problem.
I'm not endorsing one kind of oil over the other, only stating my personal observations.