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I've used Chevron Supreme, PYB, Rotella T5 and now Defy and honestly couldn't tell much difference at all between them. I will say that my last change on Defy has quieted it down just a bit. Not that it was very loud but it is noticeably quieter.

I swapped out Rotella T5 and just threw in some 10w30 Defy and it is noticeably quieter and smoother. $15 for a jug at WM, we'll see how the UOA comes back next year and see but so far so good.

Whatever. I've switched all filters to Fram Ultras.

1997 Grand Cherokee (4.0L) 12 months, 4k miles on oil & filter Drained Rotella T5, replaced with 10w30 Defy Left Fram Ultra on for one more round.

Man, going to make me feel like I'm going to pull my filter off too early in 12 months when I do another OCI. That would put it at 8k and 24 months.

Glad to see all three of the engines in my cars mentioned in here! None are without their problems but they are all near 200k and have never left me stranded.

If your car is going to sit for a while, wouldn't it make sense to remove the battery and place it somewhere you can throw it on a charger occassionally, say on something like a battery tender? I would think it would be more economical than having to replace the thing.

Originally Posted By: 901Memphis Originally Posted By: InvalidUserID I've got one on all the cars I do changes for and plan on keeping them all on for double duty service. Two changes at 6K a piece. Make it 3 changes per filter and you're set. On the most seldom used car, that would be...

I've got one on all the cars I do changes for and plan on keeping them all on for double duty service. Two changes at 6K a piece.

Originally Posted By: mehullica You have a higher than normal level of O2 on your readings. A vacuum leak or lean mixture will raise the O2 levels. Your HC & CO are decent which means you're not having a catalytic converter issue. I think your engine has a small vacuum leak causing a run too hot...

Originally Posted By: Skid Originally Posted By: InvalidUserID I have/had a very slight timing cover leak... That would be enough, hence the earlier pressure testing recommendations. My guess - your system is low on pressure because of this leak, and the coolant is boiling at some points in...

Thanks for sharing your opinions guys. Plug wires are relatively new, about 20k on them. Not sure I have enough time to add a cleaner and burn the tank as the sticker expires this weekend. I paid but due to smog fail, it's an incomplete registration. Not sure if I can still get a ticket, don't...

Co-worker of mine asked how the smog went. When I told him about the lack of fan during the smog runs, he thinks that might have had an adverse effect on the numbers as well. Cooler morning and making sure shop points the fan at the car, numbers improve?

UPDATE: Replaced EGR, numbers improved quite a bit at 15 mph but not enough at 25 mph. The car was run about 20 minutes prior, 10 minutes on the highway or so (more on temps later). Here are the numbers on this rescan. The smog shop suggested I come back in the morning when it's a bit cooler...

Originally Posted By: Fleetmon I run Rotella in ours. The rear main seals are pretty simple on the 4.0 engines. Both my mechanic and a friend mentioned that the rear main seals are two piece and are a pain to get right.

Used just about every type of oil in my version of the engine and could never tell a difference and UOAs never really changed either.

Different model, same 4.0. I've used PYB, Chevron Supreme and Rotella T5. Couldn't tell any difference, UOA all looked good. Yup, just something oily.

I keep hearing about cheap aftermarket cats however given that California is super strict about them, wouldn't a cat that is OBD II/CA CARB legal be considered quality? The cat currently on now is CA-legal CARB certified/approved.

Originally Posted By: Chris142 part of the smog test is a test of the egr. if the smog guy did his job and did the state mandated test and passed the egr then the egr system should be fine. I looked through my past smog tests, they all only show "VISUAL EGR" as a PASS and an N/A to "FUNCTIONAL...

Thanks for all the input everyone. I've never failed an emission test before (come close, but never failed) so it's something new to worry about. I've had the car for the last 14 years and 140k miles and haven't cleaned any EGR related items, just replaced the valve many many years ago. Come to...