Oil change interval? And never rev'd over 3000 rpm?

Exceptionally rare.
Of course, now you just jinxed yourself.

Mine has about the same mileage.
And had many repairs, big and small, along the way.

The engine was used in London taxis, would be plenty of them with over 1,000,000 miles & still rattling along!
I had a Mercedes 300D that did over 2,000,000 Km & was still going. No major issues.

Nice We have a 300 sd. I think that's what it is. The body and interior is shot it is so rough it hasn't been on the road in probably 10 or more years. I know it's a s class. I'm pretty it's a 300 but I could be wrong. I'm thinking about dropping the motor and driveline into something else.

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The S series diesel didnt make it to Australia, neither the turbo engine. Yours would have been a great car in its day. A few have put the engine in XJ jeeps. Biggest issue is the sump missing the diff. Have fun if you ever do it.

This thing has been pretty reliable. Am I the only lucky one with a stock liberty crd with this many miles?

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To Mopargarage:
I would actually call replacing rockers a major problem just because of how much time is involved in getting to them and their cost. Still pretty good.

By stock do you mean original intercooler hoses, no EGR delete or tune that deletes it or off road mod? Does it have torque converter shutter or did it get the F-37 dealer "FIX" ? Updated Fuel Head?

I would call no issues is replacing wear items like brakes and tires and filter and fluid changes just things listed in the owners manual maintenance schedule which would include the Timing Belt water pump replacement on schedule.

To Mopargarage:
I would actually call replacing rockers a major problem just because of how much time is involved in getting to them and their cost. Still pretty good.

By stock do you mean original intercooler hoses, no EGR delete or tune that deletes it or off road mod? Does it have torque converter shutter or did it get the F-37 dealer "FIX" ? Updated Fuel Head?

I would call no issues is replacing wear items like brakes and tires and filter and fluid changes just things listed in the owners manual maintenance schedule which would include the Timing Belt water pump replacement on schedule.

To Mopargarage:
I would actually call replacing rockers a major problem just because of how much time is involved in getting to them and their cost. Still pretty good.

By stock do you mean original intercooler hoses, no EGR delete or tune that deletes it or off road mod? Does it have torque converter shutter or did it get the F-37 dealer "FIX" ? Updated Fuel Head?

I would call no issues is replacing wear items like brakes and tires and filter and fluid changes just things listed in the owners manual maintenance schedule which would include the Timing Belt water pump replacement on schedule.