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when I changed to Motul, I gained 1/2 a bar at idle pressure (now 2.8/3.0 bar) and a bit at working pressure (now 6.0/6.2 bar), my peak values are scary though (only hit it once but), 8.95bar
Motul 15 50 during the Winter will give far higher pressures than say 10 40 and during the Summer pressures are likely to be lower generally and particularly noticable on start up. When the oil is cold, even on a 5w30 I keep below 2500 rpm to avoid high oil pressure ie. 110 psi plus.