"Disclaimer : I am not a mechanic by any stretch of the imagination" Hi all! I recently bought a 2007 GS500 and while the oil looked good upon purchase, i decided to go ahead and change the oil. I am not sure what type the previous owner put in it, but i went back with Mobile 1 10-40 synthetic motoorcycle oil. Oddly, after filling up the crank case and starting the motor, i noticed that it idles 100-200 rpms lower. It was 1200-1400 and now it's generally 1100-1300. Appears to be this case after a few cool downs/start ups. Is this normal when switching from a mineral based oil to a synthetic? If he had a heavier oil in it and i went with 10-40, could that have done it? Is this even an issue i should be concerned with? Thanks for any of your input! New member and i really dig the information and support from this site!
Weather the same? I'm in the East coast and it has gotten hot & muggy. Notice the same symptoms. Normal less dense air.
Make sure you haven't overfilled the cases. Measure the oil level with the bike level ( fore/aft AND side to side). Too much oil will drag as the cranks hiy it and lower the idle RPM.
Ummm. . I'm entirely prepared to be wrong. But isn't Mobil 1 seething with friction modifiers? .. it's not JASO rated either?! ...
Friction modified oil is a BAD IDEA in a wet clutch situation. . Nearly all bikes use a wet clutch!
Quote from: Janx101 on August 12, 2016, 01:55:48 PM
Ummm. . I'm entirely prepared to be wrong. But isn't Mobil 1 seething with friction modifiers? .. it's not JASO rated either?! ...
Friction modified oil is a BAD IDEA in a wet clutch situation. . Nearly all bikes use a wet clutch!
The only thing wrong with Mobile 1 10-40 synthetic motorcycle oil is that it's kinda pricey for a GS500. Never saw a 10w-40 oil that wasn't suitable for a GS, the energy conserving oils are lower viscosity ones like 10w-30, 5w-20, etc that are marked with this donut symbol, don't use with wet clutch:
(http://beta.motorist.org/uploads/publishing/large/oil2.jpg)
I like the 15W-40 heavy duty oils like Shell Rotella T, Mobil Delvac, etc for the GS.
Sometimes Delvac is cheaper than Rotella so that's tempting.
I use valvoline 15w40 diesel oil anyway. . Which is jaso rated :)