What oil do you use?

[Old 94 Turquoise]

I have a 1994 gmc k1500 with a 350 tbi, I was wondering what oil brand and weight do you guys use? I’m having low oil pressure when it is warm , I was thinking about switching to a thicker oil to get my pressure up . What do you guys think?

I use chevron conventional 5w30

 

[454cid]

How low is low?

Heavy oil is harder to push. Once the bearing tolerance are out more pressure doesn't mean anything. If you run heavy oil consider it a temporary fix.

I tun 10w30 in my 454 with 285K miles because even though 5w30 was factory fill, 10w30 is also approved, and the oil I buy doesn't come in 5w30. I also run 1 qt of Marvel Mystery Oil.

 

[Dre319]

I use Royal Purple 10-20 weight. Truck seems to like it. 98 K1500


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[ima93chevyguy]

I run regular castrol 10w30
350 TBI

 

[Old 94 Turquoise]

How low is low?

Heavy oil is harder to push. Once the bearing tolerance are out more pressure doesn't mean anything. If you run heavy oil consider it a temporary fix.

I tun 10w30 in my 454 with 285K miles because even though 5w30 was factory fill, 10w30 is also approved, and the oil I buy doesn't come in 5w30. I also run 1 qt of Marvel Mystery Oil.

It’s about 10 psi at idle when warm , i was thinking about switching to 10w30 it will sometime go to the lowest dash mark before the red

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[BNielsen]

Amsoil 10W30 in my 96 454 with 163K miles on it.
I used to run Pennzoil conventional 10W30, but made the switch to synthetic and I don't think I could ever go back. It's improved my oil pressure, reduced clatter from the valvetrain, and I've extended my oil change intervals from every 3K to 6K.

 

[Gramps]

The difference between 5 and 10w 30 is negligible at best. Only thing you are affecting is the viscosity on cold startup. At operating temp they are the same.
If anything go to a 10w40.
Before panicking about the oil pressure being low, grab a mechanical guage and verify the dash guage is reading correct.

 

[454cid]

It’s about 10 psi at idle when warm , i was thinking about switching to 10w30 it will sometime go to the lowest dash mark before the red

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10 psi at hot idle I believe is still in spec... not good, but in spec.

I'd 2nd Gramps advice about connecting a mechanical gauge, if you're worried about it.

 

[ColoradoMadMan]

On my 98 K1500 I use the NAPA or mobile1 synthetic, whichever is on sale and a wix XP 51036xp filter (305 engine w/standard) changed at factory suggested intervals. Does me good.

 

[884x4310ci]

I use valvoline VR-1 10w30 in all my cars. My truck sometimes get shell Rotella 15w40.