What type of Oil do you use?

[truespirit]

Having worked for Chevron for 30 years, I use Delo 15/40. Every 10,000 miles, we would take a sample and send it to Fabor Lab. for an analysis, like a complete blood test. Never in driving for them, did we ever loose an engine from oil. I believe that no engine works harder then a diesel, and I have been using Delo in the bike for 34,000 miles, and change it every 3000 miles. Our summer heat here is llike Vegas, so 15/40 fits the bill.