mmills023
Member
All - I have just acquired a 400DB with 2005 Cat C7's. I would like to get a fresh oil change and am looking for advise on what oil/weight to replace with. I called CAT and gave them my serial number (C7X00516) and they recommended 15/40. I read somewhere that perhaps i should use straight 40? The boat will be used in Chicago on Lake Michigan. Any advice or thoughts would be greatly appreciated!
Mike
Mike