186,000 on my 1996 Jeep Grand Cherokee 4.0L
Purchased in 1998 with 32,000 mi and done at various quickie lubes (mostly Citgo 10w30 oil used) at 3000mi intervals, until 80,000mi. At that point, I started caring for it myself with 50/50 mixes of 10w30 syn/dino (QS, Pennzoil, and Valvoline at...