Well after reading this thread, I was a little skeptical about that letter from Shell. I called the number in the letter and asked for technical service. I was connected with Richard Moore, and he explained to me that because of the newer diesel particulate filters, they formulated the Rotella T Synthetic 5w-40 CJ-4 with a lower ash content of 1.0 which is well within the JASO spec. He also told me that they spent $10,000.00 to do the wet clutch testing to satisfy JASO requirements.
I asked him why it didn't have the JASO spec. on the label. He told me that he presented his findings to the company, but the European marketing people did not want JASO on the label because it would compete with the Shell motorcycle specific oil that they sell in Europe. Even though Shell Rotella T Synthetic is not sold in Europe.
I asked about the high heat of motorcycle engines and he told me that this oil is extremely good at high temperatures. He highly recommended this oil for motorcycles. Well, except for Harleys which he said require a 20w-50.
"Build a man a fire and he'll be warm for the night. Set a man on fire and he'll be warm for the rest of his life." - Confuseus
Last edited by jackpiner57; 08-10-2009 at 07:46 PM.