hidetheid

I use to run 20w50 in my passat for timing chain protection and valve noise. What do u guys think?

DrShaggford

I run Rotella 10w-30 in all of me Jeeps. It keeps your internals clean and quiets the XJs natural tick. If you wanted you can run this stuff for 5-6k miles but I still change mine at 3-4k. In my experience running oil that heavy is nothing but bad news.

rideordie66

run what ever you want and dont let anyone tell you differnt.

99 Purple XJ

Its not really run what ever you want in cold weather 20w 50 is way to thick and wont get oil to the top just stick to factory recomended 10w 30

extremesol

10w 30 with lucas is what I run. as far as brand any thing but cooks.

N8N

Vee-dubs like heavy oil. Haven't seen yet that Jeeps need it. Manual sais 10W30 or 5W30 in cold weather, I'm inclined to stick with that until something makes me want to change.

xj_maniac_newb

brand-wise go Mobil-1 full synthetic. Can run it for 10,000 miles so they say..

xjsnake

I can't believe I'm posting in another oil thread (I promised myself I wasn't going to do this) but don't use lucas oil additives. It's been well documented to aerate in the engine causing a foaming of the oil which reduces the oil's ability to lubricate the engine.

Honestly you really shouldn't need to run any additives in your oil given the advances in oil technology over the last 20 years.

In terms of what weight to run, people on the forum run everything from 0W-20 to 15W-40. It's really preference and what your engine seems to prefer. (I'm going to qualify that with, you probably want to run different weights in different seasons)

However you do need to be running a quality oil filter (napa gold, wix, motorcraft, mobil 1, or mopar) Never Fram.

99 Purple XJ

I run the same oil in my jeep it runs so nicely with it and plus i get to change it every 5000 instead of 3000

junior3382

I use Royal Purple, full-synthetic 10-40.... once I started using it, I saw a smoother running motor, and my fuel mileage increased by almost 4mpg. no lie. its not cheap, but as I just mentioned in another thread, money buys quality, and the savings associated with this oil has made it totally worth it for me.

DaveVmax

Run 5w -30

cant go wrong.

sam24th

I run mobil 1 synthetic
5w-30 for the winter
10w-30 for the spring/summer/fall

as far as oil filters:
NEVER RUN FRAM AKA orange can of death
I prefer the puralator gold, makes it easy to remove with the coating they have on the outside of the filter.

Luijeep

What is so bad about fram fiters? I have use them before but i can't tell if there was something wrong with them

extremesol

i have always used fram filter. In the begining jeep filters were toilet paper. My friend's 1949 still does use tp

sfcherokeeguy

I run Mobil 5000 and lucas and a fram filter and guess what my baby has 341,000 on the clock and one head gasket job so believe me the technology is improved greatly