Why the engine replacements?

[Christina Corpus]

Hi all,

This is Christina's hubby, Phil. She's shared your answers to her
previous posts/questions with me while I was on the road. Everyone
has been very helpful. Thank you.

In way of introduction, I am a carhauler--I drive one of those rigs
you see hauling 9-10 new cars to dealerships. Prior to that I was in
the towing/heavy equipment transport business, and prior to that, I
owned an auto repair business. Can you guess what my duties will be
when we find our 'bird?

Which brings me to my question.

While reading the Bluebird 'for sale' listings on various websites, I
noticed a good percentage of the listings noted, "coach has 120,000
miles, engine has 20,000 miles" or, "low miles on 'new' motor",
etc.,etc. What struck me was the relatively low mileage on the motors
being replaced.

Keep in mind I've been driving diesel rigs for several years and it's
routine to run them 500,000 miles before any major repairs, if any,
are performed, and then it will probably be an in frame overhaul. I've
also driven medium duty trucks with gas engines that ran 200-300,000
miles before anything major.

So, my question for you veteran Bluebird owners--why do I see comments
about motors being replaced in coaches that the seller is claiming has
relatively low miles (less that 125,000)?

I'm making some assumptions here--tell me if I'm right or wrong, or
somewhere in between:

1. Someone got sold a bill of goods.

2. Lack of use (5000 miles per year for 15-20 years). Engine gaskets
and seals blowing out.

3. Something regarding the durability of diesel motors primarily used
in the Bluebird.

4. Lack of proper maintenance of the lubrication and/or cooling
systems, causing premature wear or overheating.

5. Original motor was underpowered and the replacement was an upgrade
to more horsepower.

There may be more assumptions to be made, but these are the first
that come to mind.

All comments are welcome.

Thanks,

Phil