My truck has an oil guage but its oil pressure seem awfully low.Starting out it looks like it may be 40 psi but as it warms up it drops to like 10 psi.I have owned many trucks and they all had 40 psi or better at all times.Im in a quandry.
Keywords:Tundra
Possible the oil pressure sending unit has a leak and is reading improperly. Replace the oil pressure sending unit first. An engine requires 10 psi of oil pressure per 1,000 rpm to properly lubricate. So 10 psi at idle is OK as long as it increases as the rpm increase. ex. 20 psi at 2,000 rpm , 30 psi at 3,000 rpm, etc.
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