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I changed my diff fluid at 12,000 miles on the recommendation of the dealer. I did it myself. That was the ugliest blackest fluid I had ever seen. Also the diff was overfilled from the factory. If there is water in the diff the fluid should be milky brown. Good Luck. jk-forum has instructions

Once that diesel breaks in, I would think the mileage will go up.

2x

You did not say how many miles are on the engine. Low and/or fluctuating oil pressure can be caused by worn cam or rod bearings. It may be time for a new engine depending on how hard you drive it. You may be able to connect an oil pressure gauge that reads the actual pressure. Besides my 08...

Bump to a good thread.

When you start the fridge, put 2 frozen bottles in the fridge, the temp inside will be below 35 within 15 minutes or less. You can immediately load your supplies. You do not have to start cooling the fridge the night before.

Flush the brake lines. The wheel cylinders are probably full of rust.