10:57 am
June 11, 2015
Offline
I was just wondering what other peoples experiences have been with the jk 3.8, on my last oil change i used mobile 1 and have been getting a lot of valve train noise on startups. i noticed that it seemed to get worse with the mobile 1. i just did another oil change back to Castroil syntec with Titanium and it is completely quite upon startup. so if anyone else is having this issue it is worth trying.
3:35 pm
Club Trailmaster
March 13, 2015
Offline sounds like a v8 swap is in order 
4:39 pm
June 11, 2015
Offline kris_olof said
sounds like a v8 swap is in order
as soon as i raise the 15k haha
6:43 pm
Club President
April 2, 2003
Offline Bretjk07 said
I was just wondering what other peoples experiences have been with the jk 3.8, on my last oil change i used mobile 1 and have been getting a lot of valve train noise on startups. i noticed that it seemed to get worse with the mobile 1. i just did another oil change back to Castroil syntec with Titanium and it is completely quite upon startup. so if anyone else is having this issue it is worth trying.
I get lifter noise with my synthetic as well.
7:09 pm
Club Trailmaster
March 13, 2015
Offline Actually I recall one of my friends with the '08 JKUs said he switched to heavier oil (10w-30) and it helped both the noise and oil consumption issue. Something about the non-US JKs use the 10w-30 and the only reason for the 5w-20 here is a minor improvement on EPA fuel economy testing. This is 3rd+ party knowledge from a year back so don't quote me.
11:01 pm
April 23, 2012
Offline I switched to 10-30 for the exact reasons Kris mentioned - the oil filter also played a part as some drain back far more than others. I belive the motorcraft (ford) and maybe the Bosch are the ones I have had best luck with.
If you feel you must run the 5 20 for some reason (I'm of the opinion it's not a good idea as remember at the base this is a1980s carry over iron block v6 when that weight of oil would of never been considered) the Lucas oil stabilizer helps
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