i went to suzuki dealer and bought 3 u.s. quarts of oil and a new filter for a 1995 vs800. i told the dealer to give me the oil that he recomends. he sold me 20w50 when i got home , i noticed on the fill plug that its stamped 10w40 whats the difference? can i use the 20w50?

Unless you're starting the bike up in extremely cold weather, it shouldn't make a difference.

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2005 Triumph Bonneville
2005 Suzuki V-Strom 1000
2003 Triumph Trophy 1200
2009 BMW F650GS (wife's)
1990 HD Sportster XL883 (for sale; wanna buy a Sportster??)

Yup. Or unless you've modified to high compression pistons and all that, which if you're asking this question, you haven't.

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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

no modications, temps in 40,s this morning high 70 so temp shouldnt be a problem, i guess i will run the 20/50 trough the summer month, (average temps here in pa 70-80 june to sept).and switch back to 10/40 inthe fall. i appriciate all the input and help, thanks!