Lower oil pressure
#1
Lower oil pressure
I recently just switched to a full synthetic oil from regular oil. I have noticed that when the oil is cold that it has the same oil pressure the regular oil had (around 75 psi for both cold), but when the full syn gets to operating temps the oil pressure is way below (around 60) what it was when the regular oil (around 75) was at operating temp. Is this normal? Is it because I am using a different weight of oil to? I broke the engine in with Valvoline 50W, and used Valvoline 20W50 till about 850 miles ago when I switched to the Valvoline Full Synthectic 5W30.
#4
TECH Addict
iTrader: (2)
The proper oil viscosity is not determined by maximizing hot oil pressure. If that were the case higher viscosity would always win regardless of the internal lubricating/cooling requirements.
Unless you have deviated from OEM main bearing clearances, the appropriate viscosity is in the vicinity of 0W-30, 5W-30, or 10W-30 for the street. Higher viscosities may be appropriate for sustained high speed running, such as road racing where heat (measured in terms of oil temperature) and fuel dilution are a factor.
Unless you have deviated from OEM main bearing clearances, the appropriate viscosity is in the vicinity of 0W-30, 5W-30, or 10W-30 for the street. Higher viscosities may be appropriate for sustained high speed running, such as road racing where heat (measured in terms of oil temperature) and fuel dilution are a factor.
#5
I have Clevette 77 race bearings in the engine. I don't know if the bearing clearances have changed. The engine builder didn't tell me anything on that when I ordered the engine.
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#9
TECH Addict
iTrader: (2)
Finally, I would ask the engine builder about the main bearing clearances as compared with OEM.