Some advice
I have a 4.2 l engine in a series 2 and it seems that the previous owner of the engine put a 3.8 l oil filter assembly on it
I'm having low oil pressure issues when hot since I put the engine in and was looking at all the easy fix solutions first before the more serious ones
I've replaced the oil pressure relief spring and valve, no change and I have verified that it works. Checked oil pressure with mechanical gauge, did not rely on the electric gauge
I removed the oil filter assembly and cleaned everything including the oil filter by pass valve as well
Next I'll remove the engine sump and check the oil pipes O rings and inspect pipe condition. Then check the oil pump assembly, may replace as a matter of course since I'm in there
Can anyone confirm if the wrong year oil filter assembly would cause low oil pressure (10 psi at idle or lower)
Any advice would be really appreciated
Mark