Dropped my oil pan at 218k miles and the sludge story changed in 3 weeks
My 2007 Corolla had 218,000 miles on it and the oil was coming out black within 500 miles of every change, which bugged me for months. I started doing a half quart of diesel in the crankcase for the last 100 miles before each change, and after 3 changes over about 3 weeks the oil was still amber on the dipstick at 500 miles. Has anyone else tried a slow flush like this, or did I just get lucky with a Toyota motor?