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That's aweful thick oil, especially when the engine is new and tight, it would keep the flow rate down. At that Compression ratio you would be knocking and pinging on regular gas at sea level, you running premium or keeping it at high altitudes? Sounds like you have more gauges than me :-) On the engine I have in the Square right now, running 30wt oil the pressure started out at 38PSI at 3400 RPM, it came down to 34 or so in the first 10 or 20Kmi, stayed there for many miles then started drifting slowly down at the same conditions after 60 or 70Kmi, its now down to about 26psi (at 101Kmi) if I ran the 30wt, but I have switched to the Pennzoil high mileage oil (10W40) that gives me an extra 2-3PSI over the straight 30wt. No precipitous falls yet and Ive never had any flickering oil lights at idle... always several PSI at idle even after a highway trip on a hot day. ONE THING I HAVE NOTICED.... as this engine and others get higher milage, when accelerating back up to speed after a long haul on the highway the oil temp (measured at the stock oil cooler) goes through much more change than when the engine was yongue... it spikes very quickly as one accelerates and then comes down again, and it can spike 20 or 30 degrees higher than the highest steady state temp. At first I thought it was blowby but my current engine still has the same compression it has always had.... Hmmmm.... Keith In response: It might have been a case failure, but I don't believe so. The compression was 7.65.1, the oil was 20/50 summer, 10/40 winter. The oil temp and cylinder temps were under constant surveillance ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~