Did I void my warranty?

FccinAZ

Active member
Jeep 392 of the Month
Joined
Jun 11, 2022
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Location
Arizona
Current Rides
‘22 392XR
Ok, the title is sensationalized, but I performed my first oil change today at 1000 miles with oil other than Penzoil. In my JK with the 3.6, I had the notorious lifter tick. It went away with Castrol and overall, the engine sounded and felt smoother. The 392 is a noisy beast with ticks, whistles, and tapping so I figured between oil changes, I’d try the Castrol 0W40. No difference. Someone said that Castrol changed their manufacturing process in 2018 so maybe that‘s it, or maybe this engine just likes to make a racket. Anyhow, I’ll probably just use the Penzoil in the future.

Some takeaways:

1. The drain plug is SAE with the steel pan, 1/2 inch. 13 mm was too loose.
2. After removing the filter, oil gets inside the dust cover of the steering stabilizer and keeps dripping. I’d try to cover that with something beforehand.
3. Took the full 7.5 quarts
4. Oil pressures at idle is 30, cruising at 51-53, and wot 61-65.
5. Drain plug was torqued correctly from the factory, we’ll see how the dealer does for the free oil change.

As far as brand of oil, I suspect any of the premium oils will do fine. It probably has more to do with loyalty and experience than actual differences. My experience was what led me to try the Castrol, but now that I have, nothing changed so my loyalty is reset. I don’t think these engines will fail because of the brand of oil you used as long as you take care of it in the first place.
I’d be interested in anyone else’s experience with the other brands.
 
Like you I am a firm believer in a 1k mile oil and filter change on a new vehicle.

I always let my dealer perform the work and double check everything before I leave the service center. Those minimum wage oil change jockeys workmanship can be sketchy at times.
 
Curious... coming up on 6k miles and if I should go to dealer or one of the oil change places. Never had an issue with jiffy lube et al with my jeep grand cherokee....
 
I get my company vehicle serviced at a Valvoline quick lube store. Impeccable service and zero upselling.
 
It likely relies more on your level of paranoia since oil changes aren’t rocket science. If you have a shop that you use regularly and have a relationship with them, I’m sure they’ll take care of you and your Jeep. I just like working on my Jeep and with all the new advances and complexities, oil changes are one of the few things I can still do with just a wrench.
 
Curious... coming up on 6k miles and if I should go to dealer or one of the oil change places. Never had an issue with jiffy lube et al with my jeep grand cherokee....
Just had my second oil change done at the dealer; first one was great. After they returned my Jeep, I checked underneath for leaks and spills; then asked to talk to the mechanic. He came out of the garage carrying a rag; asked me if there was an issue; I thanked him for taking good care of my Jeep; then handed him a nice tip. It’s my way of incentivizing quality care.
 
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