Oil pressure readings

[99Vortec]

had to check mine with an engine oil pressure test kit....

Switches will show a variance.

(For that matter, so can test kit's. )

 

[SunlitComet]

hm type has additives that make you seals swell and will ruin them faster over time. cruising pressure is still okay but the idle is getting kinda low now even with 10-40in there. if you switch to 5w-30and gets lower your bearings spaces are getting to big or the pump has issues.