Bought a 99xj 2 weeks ago, finally getting the chance to flush and change the oil, what would be the best recommended oil to use. 4.0 with 225K miles.

 

I as well as a lot of people use Shell Rotella. With a Mopar, Wix or Napa Gold filter. It's really up to preference, just don't use a Fram filter

 

I just use mobil 1 full synthetic and a wix filter.

 

Any feedback on the K&n filters? And what weight oil?

 

K&N is a good filter....but then there are plenty of readily available good filters that don't have a $6 bolt head on them.

 

Ok, I've seen them just never used out heard any reviews about them, I'll go with wix. I'm horrible at choosing oil weight though what would be best?

 

Whats your temp range? Cold or hot normally?

 

It runs right at 210 pretty constant

 

Since you're in TX, and have alot of miles on your engine, 10W40 may be appropriate. I'm also a fan of Wix/NAPA Gold.

 

this but i use a mobil 1 filter as well.

 

Read this.......by Sunday night, u will become a motor oil expert.

http://www.supramania.com/aehaas/

 

The viscosity you use depends on the climate you are in. A person in Hawaii is not going to use the same viscosity as somebody in Alaska in the winter.....

From the manual:

If the outside temperature is primarily above 60 degrees farenheit, use 10-30

If the outside temperature is primarily below 60 degrees farenheit, use 5-30

I see no reason to not follow the engineer's recommendations here.

 

Times change.....can u even buy "SJ" rated oil anymore?

 

I run 0w-30 with a mopar filter.

 

atta boy

+1 read the link from djb383