I went to 0w-40 Mobil 1 and did several oil analysis. It mostly cured my start-up ticking and gave great wear numbers. My mileage is not that much so I change it only once per year with a filter change at 3000 miles with top up. Total miles on oil would be about 6K/yr. You can probably go longer with regular driving, but I would prove it out with UOAs. Of course if you have a leak the synthetic gets pricey.

Last edited by pcc; 07/01/09 08:26 PM.
92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles