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General Category >> Rubber Side Down! >> recomended oil wieght for an S40?
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Message started by darkstar on 09/05/08 at 14:15:42

Title: recomended oil wieght for an S40?
Post by darkstar on 09/05/08 at 14:15:42

Hi it's me again? I lost my owners manual for my 2007 S40 and I can't remember what oil weight they recommend? Is it 10-40W? And which would be best; synthetic or conventional. I'm often confused as to which to use as I only what the best in my bike. Any guidance will be great. Thanks.

Title: Re: recomended oil wieght for an S40?
Post by Bleemus on 09/05/08 at 14:21:50

full synthetic 20w-50 Castrol is what I use and the bike seems to love it!

Title: Re: recomended oil wieght for an S40?
Post by T Mack 1 on 09/05/08 at 14:29:50

002E27272F3731420 wrote:

full synthetic 20w-50 Castrol is what I use and the bike seems to love it!

Synthetic, 20w-50 also, but I'm using Mobil 1 V-twin. Local Walmart & Auto-Zone carry it, but NOT with the car oils.

There is a 2002 Owners manual to download in the Tech Ref section (look in the index (link at the top). Only differece between 2002 & 2007 is the badging and the two extra handlebar switched, (Flash to Pass & Hazard Flashers)

Title: Re: recomended oil wieght for an S40?
Post by darkstar on 09/05/08 at 14:34:07

Thanks guys!

Title: Re: recomended oil wieght for an S40?
Post by Royal on 09/05/08 at 15:28:53

My 2008 S-40 manual says 10W-40 or if not available use 20W-50 from 14 degrees up (F). 15W-40 or 15W-50 for temperatures a little over zero (F) up and finally 10W-30 for -4 to 86 degrees F.
There is a caution NOT to use oil that is classified as friction reducing or something to that nature. Do not use additives either as this can affect the clutch. I put Mobil 1 in mine just as a personal preference. (It's only a couple of quarts-my Dodge diesel pickup takes 11 quarts)

Title: Re: recomended oil wieght for an S40?
Post by Jay on 09/06/08 at 01:44:23

Well, I wondered what was taking so long. Having read Rubber Side Down start to finish, we seem to cycle through an "oil war" on a regular basis. The forum was a little behind schedule, and I was starting to worry. Let the games begin! :)

Title: Re: recomended oil wieght for an S40?
Post by barry68v10 on 09/06/08 at 06:00:15

Most owner's manual recommendations assume non-synthetic oil, which will break down over time and "thin." If you're going to use full synthetic oil you can ALWAYS move to the next "thinner" oil. For example, if the OM says use 10-40, you can use 10-30 or 5-30 full synthetic. After about 50 hours, most petroleum 10-40s are no thicker than 10-30, and some 20-50's break down to something between 30 and 40...

As a general rule, thinner oil will give you easier starts, better mpg, and cause the engine to run cooler. Thicker oils generally offer more film strength, shear force & shock load resistance (for gears), less oil leakage, and in petrol only oils, longer life before the oil gets "too thin."

I'm currently using Amsoil 10-40, but am switching to Amsoil 10-30 on my next oil change. Both are full synthetic & wet clutch compatible. Just my two cents...but like Jay said, and others have said, there's an oil war here every so often and I guess we were due. ;D