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  #13  
Old 08-20-2015, 06:07 AM
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Re: Break in and first service

Engines these days are not your "fathers" engines. They are built to tight tolerances and standards. Other that a very short break in, they are good to go out of the box.
These engines are very clean, and kept very clean when assembled.
Really should not use oil between changes as the tolerances are there from the start and do not have to be "worn in" as in the old days.

Oil is also much higher quality as long as you stick with the top tier oil as recommended for your Cherokee.
You are only required to follow the oil life gauge on the Cherokee, Or 12 months/10,000 miles.
For myself:
I take it into the dealer for the changes twice a year. I use to be a 3/3000 mile guy but realize that's insane now a days and a waste of money. I use conventional oil and the dealer has never pushed synthetic. Also the side benefit is they will scan my Cherokee for any codes and/or TSBs needed.

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  #14  
Old 08-20-2015, 07:17 PM
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Re: Break in and first service

I was just as concerned about the transaxle and rear drive module break in.

The relatively small transaxle includes the 9-speed transmission and open differential. The AD1 adds the transfer gears and the AD2 and ADL add in the 2-speed gears and Neutral Mode with associated actuator motors, forks and range sleeves. There's a lot going on in that package. Then the RDM has the open differential and Torque Transfer Device (wet clutch assembly), and AD2 and ADL add in the 2-speed gears, and ADL adds the mechanical locker, plus the actuator motors and forks to move and engage/disengage things.

I noticed for the first couple hundred miles the transmission temps wanted to shoot up. Then things settled afterwards.
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Old 08-22-2015, 09:11 AM
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Re: Break in and first service

I agree with the Transmission analysis. Its very compact and very subject to heat in that small package.
Contrary to thought out there, There is a certain element of tempering that has to happen with the gears. That is heat up and cool down in the actual installed transmission/differential. Gears today are much more tempered than they were years ago but still need to complete that hardening process in operation.
Over heating early on is not good for the long live of those gears or the fluid.

Any doubt about that check out the trailer tow break in requirements. Much tougher than the initial 300 mile break in.
No towing for 1st 1,000 miles and do not exceed 50 mph for the first 500 miles of towing.
One reason for that is not to generate lots of extra heat on the gears and associated parts till they are tempered to higher operating temps required by towing. Damage the fluid and its a long slippery slope till part(s) start failing.
It never hurts to be more cautious and extend those miles out further in this area. But again its not your Fathers car of years ago.
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