Hi,
The engine bypass valve is 4 bar, so you know the valve is working correctly if it doesn't go above.
If it doesn't go below, you're using to thick an oil. You should be using synthetic 5w30 or 0w30 oil.
Thanks
P.S. My eingine starts af 4bar, but drops to 2.2 idling when hot.
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'89 Volvo 240GLT B230E/AW70
'14 Volvo V70 SE D4/M66 FWD
'70 Chevrolet Chevelle Malibu
'95 Saab 9000 CSE 2.0 Turbo Auto
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