[Dobie Gillis]

I have used diesel motor oil in the past but always had a concern that the detergent package may be detrimental to a gas engine over time. The stuff turned black much quicker than gas engine oil which suggests the detergents are doing their job. I started worrying that the diesel stuff was loosening so much gunk that it might clog the pick up screen and cause oil starvation. Now I use a high mileage conventional oil, usually Pennzoil, along with STP and change it 2X/yr. My car isn't driven daily.