Engine oil Executive summary: The commercial grade oils are clearly superior to the mass market oils. For the best protection in your bike or car, use Shell Rotella Synthetic, available at Wal-Mart in blue containers for $13 / gallon. For the best petroleum oil you can buy, get Shell Rotella T, Mobil Delvac 1300, or Chevron Delo 400, about $7 / gallon at any auto parts store. On the back of most oil cans is a circular stamp with the certification. Avoid oils that say "energy conserving" in the bottom half of the donut. These oils contain friction modifier additives that could cause clutch slipping over time. All XXw-20 and XXw-30 oils are energy conserving, and should not be used in your motorcycle. 10w-40 oils should not be used in a motorcycle that runs the engine oil through the transmission. Don't buy any oil additives like STP or Slick-50. Here's several pages All About Oil justifying these conclusions. I use Rotella-T Synthetic 5w-40 in my ST1300 and DL650....
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