5w40

I recently changed from Rotella 5w-40 synth (blue jug) back to Rotella 15w-40 dino (white jug). My mechanic who I trust told me the 5w-40 is "TOO THIN". I was getting a few spray drops of oil on my lower left pant leg when riding and it always seemed as though the left case covers and valve...

:confused2:Anyone tried the new synthetic Mobil 1 5W-40 Turbo Diesel Truck oil? I have been talking with Exxon-Mobil to see how it compares to Mobil Delvac 1 5W-40 synthetic, and they are telling me that there would be no performance advantage of using one over the other, although the...