When I bought my MG, it had a Fram Ultra-Guard on it and ran 40-45 psi at warm idle. Since then, out of preference, I've been running a Motorcraft FL-300 and managed the same oil pressure.
I changed the oil today, but opted for the larger FL-1A filter this time around. I'm still using the same oil as what I drained-VR-1 20W-50 but I'm now seeing 65psi at warm idle and the engine will bounce off the oil pressure relief valve(75 psi) at speed.
If anything, I'd expect the larger FL-1A to give me lower pressure than the FL-300. The FL-1A was bought new from the local Ford dealer on Wednesday. The removed FL-300 was bought some time in the fall of 2016.
Has there been some other change in Motorcraft filters that would have led to this?
I changed the oil today, but opted for the larger FL-1A filter this time around. I'm still using the same oil as what I drained-VR-1 20W-50 but I'm now seeing 65psi at warm idle and the engine will bounce off the oil pressure relief valve(75 psi) at speed.
If anything, I'd expect the larger FL-1A to give me lower pressure than the FL-300. The FL-1A was bought new from the local Ford dealer on Wednesday. The removed FL-300 was bought some time in the fall of 2016.
Has there been some other change in Motorcraft filters that would have led to this?