Ran mine on halfrauds 15w40 mineral oil. Cheap as chips. Changed mine at 250 miles then at 500miles. Changed to semi synthetic at 1000 miles and still running on the stuff now (Shell Helix HX7). It gets a fair bit of grief regularly and it doesnt smoke etc. Changed the oil last week (i have ran a MSD magnetic sump bolt) and there was bairly any metal particles on the plug.