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The 944 turbos have the dual oil/water cooled setup with the auxiliary water pump to keep water circulating through the turbo after shutoff. It never gave me trouble, although I did have to go through the auxiliary water pump system and replace the pump at some point. Also, it has a secondary t-stat I think.
My 2005 volvo xc70 was oil cooled only. It never gave me trouble either, but is it a low pressure setup. I do not think the newer volvo engine platform is dual cooled (I could be wrong). Every car salesmen I talk to has no clue if the car they are selling has a water cooled feature.
I will say, on the new buick regal tour x wagon I was looking at, the turbo was at least on the front end of the engine compartment, in a very accessible place. I need to see if it has water lines going to it next time I check.
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