I bought my F4 used in May and it's time to put the away for the winter. I would like to change the oil before I store it. My bike has currently 31,000km on it and the previous owner told me that he used amsoil the last time. I am not sure if I trust him 100% since he told the battery was replaced last year and turned out the battery was a junk. The bike had 7 owners before me. My question is "is it too late to go full synthetic?"

 

it's never too late. make sure it's full synthetic oil for motorcycles. take care of her...

 

I thought any 10W40 synthetic would do. no? Is there a specific brand/kind for motorcycles?

 

yes. it needs to be formulated for wet clutches. read one or two of the threads on oil.

 

I found out this
"I notice that many bikes seem to require 10w-40 oil. Most manufacturers, of course, recommend their own specific name brand. What difference really is there from motorcycle-specific oil and auto oil?
American Iron and Motorcycle Consumer News have done tests on oils and found that the difference between motorcycle-specific and auto oil is nil. The old yarn about SJ oil being deadly for motorcycles is false, as oil with viscosity 10w30 isn’t bound by the government’s low-phosphorus, low-zinc requirements. This is the crux of the car-oil myths."

 

where did you see that? american iron stuff is just that, american iron. harleys and such. they have separate engine, primary, and trans oils. their primary oil is formulated for wet clutches. their engine oil only lubes the engine, ours doesn't. truth is, the engine will run on any oil, but the clutches will not. car oils have all kinds of additives in them that is not good for clutches.

 

Isn't Amsoil synthetic? But NEVER believe what seller say unless he has papers to proof....

+1 74demon.....

I'm just surprise waited this long to change oil after purchase....usually you rack up most miles first few months or so...

 

If you don't mind your motorcycle wet clutch slipping just go ahead and put in any old automotive oil. If you don't want it to slip make sure the oil you use has the JASO-MA certification on the label.

 

also found this, " If you have an older bike and it has been using dino oil and you switch to synth, don't be supprised if you get new leaks. Old seals seem to react badly to synth and your bike ends up marking its territory!"

Is it true that the bike might leak if I switch to synthetic?

 

amsoil has a full line of non synthetic and synthetic, car, motorcycle, and race oils. same as every other brand, gotta be careful which you choose. their motorcycle oils have moly in them, so i stay away from them. just in case...