I have A 2003 Suzuki SV650S and want to put new oil in it... The bike specification says 10W-40... My question is do i add regular motor oil or is there a specific motorcycle oil 10W-40

On a wet clutch bike like the SV650S, I use motorcyle specific oil WITHOUT moly.

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2008 Ducati Hypermotard 1100
2006 Kawasaki KLX250S
2004 Honda CBR600RR
2002 BMW R1150R
1996 Ducati 900SS

so do u know of a specific oil i should use?

Your manual should tell you which one they recommend, I'm sure they will say Suzuki oil.

Any motorcyle oil that meets the requirement stated in the manual should be fine.

Some will even tell you car oil as long as it is not energy conserving is fine... Car oil may or may not make your clutch slip, I personally would not take the chance.

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2008 Ducati Hypermotard 1100
2006 Kawasaki KLX250S
2004 Honda CBR600RR
2002 BMW R1150R
1996 Ducati 900SS

Yup, go into the parts store, look for a motorcycle-specific oil, use it.

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Have owned - 2001 Suzuki Volusia
Current bike - 2005 Kawasaki Z750S
MMI Graduation date January 9th, 2009. Factory Certifications in Suzuki and Yamaha

Wrider do you know of anyone or any of your customers who used car oil and the wet clutch slipped?

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2008 Ducati Hypermotard 1100
2006 Kawasaki KLX250S
2004 Honda CBR600RR
2002 BMW R1150R
1996 Ducati 900SS

I do. It was one of the problems from my brothers 535 Yamaha. I've seen it a couple of times.

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Always wear a helmet, eye protection, and protective clothing. Never ride under the influence of drugs or alcohol.

I once had a Yamaha XT225 and that too the wet clutch slipped when I added some car oil to it.

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2008 Ducati Hypermotard 1100
2006 Kawasaki KLX250S
2004 Honda CBR600RR
2002 BMW R1150R
1996 Ducati 900SS

Honestly I haven't seen it personally, but I know of three guys who said it happened to them, and I'd much rather play safe than sorry when it comes to replacing a clutch.

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Have owned - 2001 Suzuki Volusia
Current bike - 2005 Kawasaki Z750S
MMI Graduation date January 9th, 2009. Factory Certifications in Suzuki and Yamaha

I have seen it happen to others. I have had it happen to my own my first dirt bike. I changed the oil every track weekend and thought just this once wont hurt anything. I used the same weight oil just regular automotive oil and the clutch started slipping right after the change. The clutch wasnt very old either. And after I replaced the oil again I had to replace the clutch because it still slipped. I don't know about where you are but autozone and advanced both carry motorcycle specific oil for half what the bike shops sell it for.

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1984 Honda Magna 700, 1987 CBR1000F, 1991 Nighthawk 750, 1994 FZR600, and for the dirt 1995 KTM 300 EXC and finally a 1986 KX500