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Yes they are
 

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I put plain old motor oil in my 1100, I just make sure it is a reputable brand eg castrol GTX. Never had a problem. Once, when I asked the shop why bike oil was so much more expensive the guy hummed and hawed and then said it was because the bike engine is made to tighter tolerances, revs higher, has a wet clutch, and runs hotter. Couldn't see it myself, according to the specs on the side of the can bike oil is manufactured to the same SAE and BS specs and viscocity as the motor oils.
 
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