I have a 2000 xj classic with a 4.0, I'm currently running royal purple 10w 30 with the matching oil filter, I was using castrol edge synthetic in the black bottle, mines also a daily driver, I only use synthetic oils, what's the best brand to use?

 

a lot of people will say im crazy for paying the price but im a very firm believer in royal purple oil. had great luck with the stuff. picked up 3 horsepower on the dyno and gained 4 mpg using it in my honda civic.....so when i bought my xj it got changed to royal purple the day i brought it home. my xj runs well....and i get about 22 mpg on the highway.

 

How many miles are on ur xj

 

176 thousand and change

 

honestly....im using royal purple 10w30 in my xj.....using royal purple power steering fluid....and plan on switching out my diff lube front and rear to royal purple 75w90 gear oil. thinking of switching my tranny fluid to royal purple max atf also

 

When I searched for "best oil" threads on this forum I got 13,400 results. I politely invite you to look at one of our many other threads in the subject.

Incidentally, it does not matter. You simply MUST use a quality oil filter.

I run Shell Rotella T6 5w40 and a WIX 51515.

 

Quality filter is much more important than oil choice. Yessirree.

 

bingo - napa gold filter for my 2 jeeps and my dodge

the straight 6 is a tractor motor, i run 10w30 High Mileage...i got 122k on it....but i run HM oil in all my vehicles

 

5w40? really in a cherokee? never heard that viscosity in a cherokee

run good with that?

 

Absolutely. Rotella T6 is one of the best received heavy duty engine oils out there and gives great use oil analyses. I won't make any claims as to fuel economy but it's a damn Jeep, I'm going for longevity.

Cruiser has an old manual where SAE40 grades are specified, and while that ended in North America preferring SAE30 grades for fuel economy, export markets were specified with SAE40s until production ended.

It's a tractor engine - turns out they love tractor oil!

 

I use Rotella T6 5W-40 and WIX 51515 filter as well. Good combo.

 

Just a note mine has 219, xxx on it

 

Well when I searched I found nothing but I only use the forum app

 

shell rotella t5 10w-30 blend with a mopar or wix filter is what i use. doing 4500 intervals with no issues at 193000. may try the 5w-40 and go 6k next time

 

Is that a synthetic oil? Cuz that's what I currently have in the engine