Shell Rotella T6 Full Synthetic 15W-40 Diesel Engine Oil, 1 Gallon

Motorcycle is a Honda ST1300 with 13000 miles on it. Have used the Rotella Synthetic, ostensibly advertised for diesel engines, but without the "high efficiency" additives, it works very well with my motorcycle. Clutch is just as good as new, and the engine uses no oil. To boot, the container has four quarts in it, and that just fills the ST. The Amsoil salesman stated that there is now no zirconium in Rotella T synthetic, but in my opinion there is a limit to the addition of trace elements to motor oil, and since the synthetic is a superior lubricant that will not carmelize, it is plenty adequate for everything except maybe flat out racing.

Did some research and found out that this oil contains the additives of older style oils of the 60 and 70's! So it protects the older engines with the type of parts that the newer oils don't necessarily cover. Put it in my old Jeep Cherokee and notice a much quieter running machine with a more consistent oil pressure. We will see how things work out after another 1000 miles or so on this batch. And I'm changing over all the oils in my 4 other vehicle to this also!