70hemicuda

while reading about on the forum today, saw a couple post about using the shell rotella diesel oil in the 4.0. I dont care about price of oil, i just want the best stuff i can get. I usually run 10-30 castrol conventional and soemtimes throw a quart of marvels mystery oil in it with a mopar filter. Anyway, Ive been reading all day about the rotella and i think i want to switch over to it. But i dont know which type to use. I took a ride over to autozone and they have the 15-40, 5-40, and 10-30. I live in jersey and go to school in syracuse so Im not sure if i should do 15 in the summer, 5 in the winter, or if i could just run 10 all year round. Ive read Salads whole bit on the rotella review and countless other posts about it being a great oil for the 4.0. I just dont know which one to use.

dmill89

You can run the 5w40 or 10w30 year round, the 5w40 T6 is full-synthetic while the 10w30 is conventional (T3) or a synthetic blend (T5). 15w40 would be fine for summer, but is a bit too thick for winter in NJ.


Most run an "oversized" filter as well, often the Wix 51515/Napa 1515/Motorcraft FL-1A/Purolator L/PL30001, etc. You can also run the even bigger (though less common) Wix51459/Napa 1459/Baldwin B7311MPG, these have a ton of filter area and are great in the winter when the oil is thick or for longer oil change intervals.

rgr4475

I'm in Jersey and run the 5w-40 T6 year round. I use the NAPA gold 1515 filter, just need to add an extra half quart as it's a larger filter.

70hemicuda

would the mopar filter be fine?

thatXJguy

Mopar filter is just fine, of course. I ran it all the time up until I refreshed my rod bearings and starting using NAPA Gold. Just avoid Fram.

For the most part, oil is oil. So long as it is a name brand, most of the stuff isn't junk. I just run Shell Rotella because I'm a bit of a brand loyalist.

Just run 10w30 oil like the manual recommends. When it's cold, run the 5w30 oil.

dmill89

Yes, but it is nothing "special", it is basically equivalent to something like a Purolator Classic. Personally I'd run a Ford MotorCraft FL-1A over the Mopar, it is as good or better construction (Basically a Purolator PureOne in a "Classic" can), offers greater capacity and is cheap (usually around $3.50-$4).


Like thatXJguy said avoid Fram like the plague, those are junk (especially the "orange can") and have been known to cause pressure issues. STP and other Champion "E-core" (plastic core with felt end-caps) filters (including any AC-Delco filter with an "E" suffix) aren't much better and are also best avoided.

70hemicuda

yeah i used a fram once and replaced it after only 5 miles with a k&n, but autozone carries mopar now so thats what i always grab. Im gonna go with the T6 5w-40, but i was wondering since it is a synthetic will it leak more? I got the rear main leaking just a couple drips every now and then but i dont wanna accelerate it.

93_xjcherokee

I run rotella 15/40 but I live in southern az

HS00XJ

I swapped to full synthetic and had a horrible experience with leaks ever since but others swear synthetic wont cause leaks.

davev

I don't think synthetic would *cause* leaks. But it might clean up some crud that is keeping it from leaking. I would choose the cleaner internals and fix any leaks if they show up. Doubt they would- low risk.

But then again I choose generic oil.