Haha I doubt its North Americans not ebing familer with diesiel engines but Turbo motors in general. Like we Do have them now but alot of our cars are jsut lil N/A POS cars with low compression and power unless its abnormally large. Seriously, I run premium in the Audi and I get weird looks and wtf from people all the time, and It also buggs the shit outta me when people with WRX's or other turbo cars run 87 or only 89... Last time I checked proper fuel is also considered matinence...Thats another stroy all together....
And because I got curious and look It seems this way about the turbo's
The pre 94 turbos "oil only" look to be journal(sleeve) bearing turbo's relying heavly on the oil to cool and the oil pressure to keep that constant film of oil to prevent metal/metal contact. With these turbos its imparitive to keep your oil changes done to preven coking of the bearing and ruining the turbo and Oil is heavly used to cool the turbo so as we'va all kinda mentions proper idle down time is imparitive to maintain your turbo's health.
So knowing its oil only feel its probably a sleeve turbo. Now the laster 94 turbos COULD have been switiched to a BB turbo and thus the required water cooling line. Or they just added that to reduce turbo stress.
also mararmeisto what is a Hollow Bearing? I know that some BB turbos used creamatic bearings or exhaust turbine to reduce mass and increase turbo heat resistance but a hollow bearing? Do you meana foil bearing I know that its a new technology but not sure how that works.
Again Im sure its a sleeve bearing due to the vehicle and cost of a sleeve bearing is significantly cheeper than the BB.
This is an important aspect when you guys deal with your EGT setup as it seems your more monitering the turbo temp (which is good. you dont want your oil coking and destroying a turbo or letting an engine shut off without cooling the turbo.
Anyways im rambling on again... Oh how I love engines and turbo's and stuff
It's not speed that kills. It's that stopping suddenly that really gets you. - JC (Jermey Clarkson)