bigapplephx

I use 10W30 Mobil Synthetic. I'm in Arizona, we just set a record for most 110 deg days this summer.....

XBlacky08X

I use 5w-30 in the winter and 10w-30 in the summer. No problems!!

fadeout

switched to 5W30 last oil change and it's been running great, that with cleaning the throttle body She starts up now first shot with no hesitation at all.

DGriz

I've put in Mobile1 5w20 for the last 20k miles and change it about every 4k and had no problems. I'm actually considering going with AMSOIL at my next change and then only change it every 10k after that. I'm just wondering if I should stay with the 5w20 or if the 5w30 would be better over a long period.

I've heard great reviews on the AMSOIL products and some poor ones on Mobile1. Castrol Synthetic would be my second choice going forward.

Tuto

Same here

C1ph3r

i know this thread is a little old and i apologize for bringing it back. we have just bought a used 08 JKU with about 38k mile on it. i think we have put about 1k miles on it over the past month and most of that was on a road trip. i have noticed the engine is get a little noisier now on start up.

I say all of that just to say thank you. I have become accustom to never checking my oil levels. I have never had a car that really used oil. and i have had a lot of cars. i am so glad i found this thread. sounds to me like i have my first engine that uses oil. i am a long time amsoil user and just placed my order of some 5w30 for the JK. Lets see how it turns out. i am heading to the garage now to check the oil level. It has been sitting for a couple days so now is as good a time as any.

thanks a lot guys for this informative thread.

Ryan0260

The 5w30 should help. Also check the PCV valve and replace if necessary

Richn001

I have done 3 oil changes now with 5-30 Mobil 1 and everything has been fine.

TyStick

5-30 is amazing. The jeep is quieter. It runs smoother. It has made a huge difference in my jeep experience. I will NEVER do 5-20 again.