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Message started by rl153 on 08/23/09 at 09:23:26

Title: oil
Post by rl153 on 08/23/09 at 09:23:26

Can running 20-50 possibly cause any problems ? It seems like mixing it with the 10-40 is not a good idea,as someone suggested.Or should I just stick with the 10-40 even if my engine seems a little noisy.I'm not sure.Thanks

Title: Re: oil
Post by jabman on 08/23/09 at 09:45:39

i run 10-40 fully synthetic oil. try some valve adjustment. the engine gets noisy when the cam chain is too loose

Title: Re: oil
Post by dasch on 08/23/09 at 09:47:09

I believe I have 20-50. No problems. Even when cold.

Title: Re: oil
Post by ero4444 on 08/23/09 at 09:55:08

here is a still-working link to a maintenance manual http://www.mediafire.com/?fn2jnyynjyi

It describes the operating range of diff weight oils. Either 10-40 or 20-50 is probably fine for your range if you are not running it in International Falls MN in the winter. Mixing oils with diff additive packages is not a good idea.

I use 15-40 (oops edit not 20-50) Rotella diesel oil lately from Walmart - since our bikes don't have a cat, I think the extra zinc/ZDP may be good.

Noisy may be normal anyway.

n.b. don't use oil marked "energy saving" or you will get slipping clutch. I think 10 is a little low but if your clutch doesn't slip then it doesn't matter.

Title: Re: oil
Post by PTRider on 08/23/09 at 10:28:01

The Suzuki manual lists 20W-50 good from the hottest temperatures down to +14°f. I run a syn blend 20W-50 with very good results.

There is nothing wrong with mixing oils, although no great benefit. Pick one oil that works very well and stick with it unless circumstances change.

I'd avoid every automotive 10W-40 oil. No 10W-40 can carry the "Energy Saving" emblem. The friction modifers in some automotive engine oils may cause the clutch slippage. My mechanic says that he can rely on Castrol Syntec to cause clutch slippage.

A diesel 15W-40 or syn 5W-40, or a 20W-50, or a motorcycle oil will be more robust. I don't think Shell makes a Rotella T 20W-50, just dual-rated diesel & gasoline engine 10W-30, 15W-40, syn 5W-40, and various diesel single weight oils. 20W-50 is not a viscosity grade for diesels.