[url=https://classicgoldwings.com/forum/viewtopic.php?p=211334#p211334:35vrxii8 said:
GTC@MSAC » Today- 16:15[/url]":35vrxii8]
I use Mobil-1 4T 10w40 Motorcycle Synthetic year round in all my bikes, air or water-cooled. It does great for me and has yet to cause clutch slippage or oil leaks. Some of my bikes have gaskets that have not been touched for 40 years. Bel-Ray used to make the best Synthetic 2-stroke bike oil, SI-7, which I used religiously in the 2-strokers I had 30 years ago. Bel-Ray now makes a full Synthetic Bike oil formula specifically for wet-clutch motor, as does Mobil-1, Valvoline, Castrol, and others. 20 years ago I tried Mobil-1 Automotive 10w40 in my 67 CA77 and yes, it definitely made the clutches slip, lol!
But the bike synthetics are very different oils altogether. Honda has been using its own Synthetic automatic transmission fluid formula in cars and mininvans for at least 10 years or more, and really seems to make a big difference in their longevity before needing a rebuild.I have not ever seen any oil-leaks caused by Mobil-1 in any of my customers' automobiles, in over 20 years of shop ownership. Any motor seals and gaskets I have replaced, bike or car, have been due to age and hardening from being cooked, overtightened, etc, but no damage from the use of synthetic oil. Standard motor oil is paraffin based, and the paraffin cooks out, and also acts like cooking oil in your motor, like in a frying pan. When a synthetic oil is introduced, it can wash away accumulated paraffin that is stopping up potential leaks in hard, cracked rubber seals and gaskets, and thus gets the blame for "causing" a leak. I have used Automotive Mobil-1 in my cars & trucks since 1991, with fantastic results as well. I have learned all this from personal experience, and not from any advertising whatsoever. Take it for whatever it's worth.
-Graves-