[ossiblue]

Eitan,

Ditto to Rex's reply. As far as fuel, if your car has catalytic converters, leaded fuel will kill them. Don't know the pollution laws where you are, but if you can remove the reactors/catalytic converters do so--the added heat are killers on the 2.7 mag cases. More information about your car will help greatly as subtle differences are found on the mid-year cars (ie. the reactors).
Your oil pressure could be an issue, but you did say the pressure was good before shipment. Still, the numbers you give (10lbs at running) are not clear, it really depends on your rpms. 10# would be low at 4k rpm. My advice, find a knowledgable porsche mechanic and have the valves adjusted, fuel injection set to specs. and check the oil pressure--it still could be the sender. Overall, 89K on the engine is not a lot if it has been cared for. I'm certainly no expert but others will add to this thread who know about the low pressure/blow-by issue.
Sounds like your'e in for the duration. Welcome and ask away. The help on this board is without limits.