As long as we are doing vehicle advice ...
Places have started advertising "deals" on semi-synthetic and synthetic oil/filter changes.
What's the good and bad of each vs. regular? Any issues switching from one to another?
Jeep Wrangler 4.0 liter, 6 cylinder. Sixteen year old engine, 70K, good shape, doesn't burn oil, always had regular changes. So far it's only been feed used dinosaurs.50-50 around town and highway haul ass with some off-road crawling. Arizona stinking hot summers and mild winters.
Any advantage/harm "trading up"?