Just curious and too lazy to research this but what is the most mileage that anyone has seen on the original 5.9 magnum in a Durango, not rebuilt? Just want to get a general idea at what mileage they need to be rebuilt.

 

We cannot this correctly. Answer will vary depending on how the user takes care of the engine! I seen users here go over 200k and never been rebuilt. I also seen users here with engine needing rebuilt at 60k.

 

Hmm maybe we should start a thread to see an average

 

I had 185k on my 2000 5.9 ram... I did swap the heads for r/t's though, the originals were cracked. the timing chain was also swapped as the stockers suck.

 

None of that matters as Steve is the Man!

 

my 84 5.9 is not a magnum but the 3 spd tranny died at 240,000. Motor still ran.

 

I am hitting 83k for 00 model and engine is still running like brand new. Wished I could say the same for my tranny!

 

Not sure how many miles but i have 192,381 kilometers on my Durango in Kuwait.
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Mine is still a baby at only 53,XXX miles.

 

Scientist;
As others have said, this is a question that almost can not be answered in a precise manner.
Many factors would go into the decision. The good thing overall is that for the most part engine technology and design is so good today that I feel pretty confident saying that 98% of the engines being made will last longer than the first , second, or even third owner cares to drive them as long as they are properly serviced.

Obviously there is a small percentage that will have flaws from the factory, and hopefully those will croak under warranty so the dealer can remedy the issue. The biggest problem these days is folks not doing simple things like proper oil changes or continuing to drive for miles after the temp guage has wrapped around the peg.

Our engines really have a pretty easy life in an automobile as opposed to say a generator, woodchipper, or boat. In those applications, there is no transmisson to allow the engine to operate at a lower rpm. As such when they are running they are either at idle, or operating within a fairly narrow rpm range that is really working them.

As an example, a friend who has a 37 foot boat with twin GM 454 engines explains that cruising speed is around 18 knots. To get the boat (all 20k pounds of it) on plane and go that speed both engines run at 3200 rpm. Our autos might face similar conditions when towing a heavy load up long grades. BTW, at that speed the fuel comsumption for the pair is a little more than 1 gallon per mile. [sm=yikesomg.gif]
These other engine applications keep track of running time inhours and not miles.

IMO as long as your motor either has been serviced well from the git go, and or you buy it new and do same, barring a few percent of the Murphy factor the engine will most likely last longer than you need it to.

Don