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Well I'm driving around with 5 quarts of store-brand 10w-30 that was lying around and 1 quart of MMO. I will definitely be changing to Rotella T6 5w-40 before winter. How many miles should I aim for with this 1 quart of MMO before I drain everything and change over to Rotella? Any need to...

Originally Posted By: gomes512 Although the 42re has a bad rep. it does last if you stay on top of fluid changes. I got one with an AX-15!

Being that the 4.0L takes 6 quarts as far as I know... I just use 5 quarts conventional and 1 quart of MMO? That seems simple enough. I'll head to AutoZone tomorrow and grab a quart of MMO and their current conventional special. I believe it's Mobil Clean 5000 and an STP filter for $13.

I've used 5w-30 through most winters, so no qualms about doing it again. I will also do 1000 miles on new oil with a quart of MMO. Does it matter what oil I choose (synthetic or conventional) when I do the 1000 miles on a quart of MMO? Beyond that, if there's no problems using Rotella T6 5w-40...

Ya, a block heater or oil pan heater doesn't sound too bad. I know my old man definitely runs one in his Ranger. I really haven't had a problem with starting any vehicle I've owned here yet. A heater is definitely a good idea though. I think I just might get around to that before winter hits.

It's not garaged at night. It's going to sit out in the elements. Is Rotella T6 5W-40 going to be usable when the cold hits here though? So to properly use MMO, I'd just change the oil first, throw in a bottle and drive it 1k miles or so and then change the oil again?

1. What kind of vehicle you have I just purchased it today! It's a 1996 Jeep Cherokee with the 4.0L 2. What your owner's manual says Beats me. I don't think I have one. 3. Where you live Minnesota. Temp range is -25'ish F in the winter to 90'ish F in the summer. Winter is quickly...