I don't know about the oil line/heat thing but I suppose one could insulate the *hot* side of the turbo or the line it's self. I tend to lean more towards dcg's idea of the 20 year old beat turbo.

Also on the starvation thing, I recently took my 200.000+ mile RTE apart and found some crusty oil deposits in the feed line and fittings. It wasn't cloged but definitly limited so take a good look at those if you have the motor apart or turbo off and clean those lines and fittings.

The motor in this one is comming out next week and the replacement block is at the machine shop now. I just need to put an order to EB and it's on.
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Dan