1998 blazer LT

Startup 45psi
Completely warm at idle 500-600rpm 20psi(this is where im concerned)

To me 20 is low even at 500-600rpm shouldnt it be at 40+ at all times??

As soon as i step on the gas it goes to 40 its onlt below 40 at idle..

 

According to GM, ~8psi is the minimum oil pressure with pressure gaining about 10psi per 1000RPM to a maximum of around 60psi.

Looks fine to me.

 

ditto...20 is exactly what mine has been for 12 years. Normal driving is 40.

 

x3....normal from what I remember of all my 4.3's...

 

ok, how about one that flickers slightly side to side pretty fast about say 1/8th inch on the gauge at idle/operating temp. mine started doing this a long time ago.

 

Could be the gauge or sensor. What year is your truck?

 

1998...