Dronac

30,000 miles. Got knock at idle, dealer said the short block was toast. Got a new short block, lifters, head gaskets, intake/exhaist gaskets, ect.

TINMAN080

Just turned 51,000 miles. Pennzoil 10W30 Dino, basic Fram filters, changed every 3000 miles. No Issues whatsoever. No oil usage ever. I drive this vehicle BRISKLY, but I don't abuse it...

GOJOHNNYGO

Almost 70K on mine, only issue on mine was the battery and just replaced with an Optima Yellow top, I've used Mobil 1 10w-30 since I bought it @ 20K miles.

metalwizard

I have an 07 with 70,000+ miles on it.

I have a nasty vibration I am sure is the engine about 3000-3500 rpm. NO KNOCKS but the vibration is getting bad. I really don;t know what to do.

I have be fairly decent on oil changes. I have been using castrol 5-20. I am thinking to go with the 10-30 just because.

I use maybe a quart between oil changes, so i think I am good there.

I too agree they should have stuck with the 4.0l my last jeep had 300,000 on the original 4.0 when I sold it. and was still going strong. the rear maul leaked like a pig but I wasn't about to change it with that many miles on it. I sold it to a college kid in town and I still see it cruising around all the time.

If this 3.8l goes.. it's HEMI time.. something Jeep NEEDS to offer like NOW!

Tgoods 09 X

After my 12,000 mile hydrolck. I have had no problems 40K. I use 5-20 full synthetic and change my oil every 3,000 and have no engine or intake mods.

remingtonJK

I have 2008 2 dr with 38000 miles. No problems other than the heater does not work very well????? I get the oil changed by the dealer every 3000 miles.

profire

Update to previous post on this thread.

Change my oil and filled with Valvoline 5W20 full synthetic. Checked oil at 500 mile intervals, added oil only when it was down 1qt. ended up burning 5 qts. in 4200 miles. no leaks anywhere. Currently doing oil consumption test at the dealer. I have an extended powertrain warranty and they assure me they will replace the engine. Service manager said he has seen more than he would like of these coming back to the dealer with this issue. I think most JK's are fine as the poll results show but there are a few that have issues. I will post the final outcome on this issue.

sciguy6

Profire. I had the same problem with the Valvoline. Changed back to Pennzoil 5W20 and no problems again (Less than a quart in 4,000 miles) May want to consider a change and see.

dlincoln91

at 43,000, jeeps water pump seal busted. lost about a gallon of coolant over 300 miles of driving home from school. all under my warrenty

tommyluv78

no real problems here at 37k. i use mobil 1 0w-20 with fram exteda-gaurd filter. change it every 6k