My 97 xj has 301,779 miles. What would be the best oil to put in? And I am fairly certain my dipstick is by stock. Can anyone tell me how many quarts go in?

check your OEM manual for quart levels. The oil drip pan is the deciding factor of oil amount. The danger with over filling oil, is that the connecting rods can slap the oil, frothing it. once its frothed, it does not pump or lubricate well. A guy, or girl, could install a larger pan if they wanted more oil (Cleaner longer).

I started using 10-40 weight especially in the summer. Im just about 300 k. Lucas oils are top notch, but more expensive. I'd recomend high mileage (for the seal additives) 10W30 in the Winter and 10W40 in the summer

Lol! Hmmm go with a good hi milege, oil, I use Rotella in mine and they both are une 200k and im gonna say 5 quarts dear.....

Boy you might just open a big ugly can of worms with "what is the best oil". I can say with out fear of opening that can of worms that if you have a 4.0 you need 6 quarts of oil.

Oh this is very true! Maybe we shoukd get it all out now? Before he is slammed! Lol

Soooo true and yet so funny at the same time. He might need more thermal protection for his butt than for his engine!

In before the lock. I run Shell Rotella in everything I own. I swear by it.

Better put ur boots on boys! Lol

Almost 7 quarts with a filter change.

Oops guess I should have made myself more clear. What weight would be the best

check here:

https://www.cherokeeforum.com/f2/oil-question-124302/

its all about preference and trial and error.

Are you sure its not 10-15 quarts?

Lol mine is 6

Thats only when you forget the drain plug.

I use 6 quarts of Delo 15w 40 and a napa gold/wix old filter evertime and shes running strong with very little valve chatter