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JimNNN · 12-23-2019, 10:59 PM

The oil was 15/40 Valvoline. I had put in a bottle of the STP treatment - which is pretty thick - because it has the zinc protection (here we go on the oil again.) Would a high volume oil pump create these cold start readings? Pressure seemed pretty normal after warmup to operating temperature. At normal operating temperature, the psi was about reading about 5 more than the mph (e.g. about 50 psi at 45 mph.) I'll drive the car tomorrow and see what it does.

12-23-2019, 10:59 PM	#27
JimNNN Senior Member Join Date: Apr 2014 Posts: 522	Re: FE 390 oil related questions The oil was 15/40 Valvoline. I had put in a bottle of the STP treatment - which is pretty thick - because it has the zinc protection (here we go on the oil again.) Would a high volume oil pump create these cold start readings? Pressure seemed pretty normal after warmup to operating temperature. At normal operating temperature, the psi was about reading about 5 more than the mph (e.g. about 50 psi at 45 mph.) I'll drive the car tomorrow and see what it does.