Hello everyone. I drive a 1995 Jeep Grand Cherokee with the Magnum 5.2 (the earlier one with the EGR). Mileage is currently at 260,000. Cold Air Intake and cat delete are the only engine mods. 180* Thermostat. I use this badboy to deliver pizza, and I drive on about a 40 mile journey (80 round trip) to Cleveland every weekend once or twice, as well as do some off road around my property. I'd say I drive about 400-600 miles every week. Lots of engine starts in there, probably about 20-30 a week. Most are hot-warm. I have a remote starter, and am very diligent about starting up my Jeep before I get in it. Usually about 5-7 minutes before getting in when it's cold, and about 30 seconds before getting in when it's hot. When I got it, it had 188k miles on it. I kept up with 4-5k OCI with Pennzoil HM 10W-40. Here is a hint on what the motor looked like after around 220k miles: http://www.nagca.com/forum/showthread.php?t=41135 Uncleaned rockers and pushrods on the left, cleaned on the right. http://imgur.com/a/ufKTK The engine had an almost unnoticeable tick that came from the bottom end. You couldn't hear it if you were standing in front of it with the hood popped. The only way to hear it would be to lay on the ground on the driver's side. It would come and go. I continued running Pennzoil HM until about 240,000 miles. Then I switched to Royal Purple 10W-40 and RP filters because of the Pep-boys 5qt+filter deal for $40. After running RP for the last 20k miles, the slight tick has become almost impossible to hear, and the Jeep still runs great. The only noticeable smoking from the exhaust is a small puff on startup, probably leaking from the valve stem seals. I consume about a quart of RP 10W-40 every 1600 miles. I have been changing the filter every 4500 miles and draining the oil completely every 9000 miles. Here's my problem. While RP has been good to me and my Jeep, it's expensive as [censored], and pep boys has discontinued their $40 deal. I want to maintain a high OCI, preferably extend it further. I would really hate to have to roll under my Jeep every single month to do an oil change. I'm not too knowledgeable on oil, but here's the options I've considered(for reference, the manual says the oil should be changed every 7.5k with 10w30 [not sure if conventional or synthetic]):
- Sticking with the best stuff I've used so far and buying Royal Purple in bulk , adding oil as needed, doing a 12k Oil Change Interval/Filter Change Interval.
- Buying Amsoil Extended Life 10W-40 in bulk, adding oil as needed, with a 9k OCI/FCI.
- Buying Amsoil Premium 10W-40 in bulk, adding oil as needed, with a 12k OCI/FCI.
- Running Shell Rotella T6 5w-40 with a 7.5k OCI with Fram cheapy filter.