You can't tell some young guys anything!

If it has a catalytic convertor the high zinc will play hell on it that is why you shouldn't run diesel oil in a gas engine, no convertor you can run it with no real problems but there are better oils that Rotella, Rotella label says meets manufactures spec. Mystic JT8 says exceeds manufactures spec

I have a 96 Neon with 250K on the odometer. Always ran Valvoline 30 or 20w50, still has the original catalytic convertor. Same for my 1998 4.0 Cherokee. Maybe if you have an oil burner?