low oil pressure

[82sbshortbed]

My 84 305 does the same thing. 10w30 mobile1 and mechanical gauge. Just changed the oil and filter. Once warm it's down to 5 to 10 range at idle but up to 20 to 30 on the highway. I figured as long as it goes up with rpm increase I'm good.

Same oil in the 454 but it seems to stay around 20 to 30 at idle warm. And over 40 on the highway. So I don't know if I need to be concerned about it or not.

 

[squaredeal91]

I would also recommend a (high volume) oil pump from melling.

 

[Octane]

Yeah I’ve been trying to find a good synthetic straight 30w oil and it’s not easy to find.

Advance Auto,O Reillys and Walmart Supertech in my area of Atlanta metro has 30wt oils

 

[cmichels83]

I have been doing research and watching videos from The Motor Oil Geek, and I think I am going to start using Mobile 1 European 5w-40 in my 83. The ZDDP package is very similar to pre-1994 10w-30. Today's 10w-30 is capped at 800ppm. 50 weight oil has more ZDDP, but if you go too thick you lose a good bit of horsepower. Go too thin, and things wear out fast. When oil heats up, it gets thinner, might be part of your problem.

 

[Ricko1966]

My 84 305 does the same thing. 10w30 mobile1 and mechanical gauge. Just changed the oil and filter. Once warm it's down to 5 to 10 range at idle but up to 20 to 30 on the highway. I figured as long as it goes up with rpm increase I'm good.

Same oil in the 454 but it seems to stay around 20 to 30 at idle warm. And over 40 on the highway. So I don't know if I need to be concerned about it or not.

No reason to be concerned 10 psi per 1000 rpm is fine.

 

[Ol_Red_1983]

Run standard 10-30 and a wix filter in my Olds and square body. Truck cold is around 60, 20 warm 600-750 idle. Stock as can be 350 and 307 Olds.