Hi there ..I worked for Megacycle cams for many yrs...... the boss would NOT warrentty cams in engines using any type of Castrol muti weight oil......... single grade OK ..... the shop has dieselmorons :shock: out back under the tree, drain that stuff and get some Dello or Rotella . your car will thank you by lasting for many yrs ......... My .02c ........ :wink: :