Lossing oil pressure, change to straight 30 wgt??? - Team Camaro Tech
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post #1 of 8 (permalink) Old Apr 18th, 02, 02:12 AM Thread Starter
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I have a mid 80's V6. When it is cold I have good oil pressure. After about 10 miles it starts to drop and ends a the bottom of the normal range (have analog oil pres. guage). I am using 10W30. If I changed to straight 30 wgt do you think this would help with the pressure loss? What do you all think?

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post #2 of 8 (permalink) Old Apr 18th, 02, 03:40 AM
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Usually if you stick with an oil that has a good viscosity index you will be better off. In other words an oil that changes little in its properties from cold to hot. The synthetics are much better in this respect than conventional oils. If this doesn't help you may have to look at mechanical problems
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post #3 of 8 (permalink) Old Apr 18th, 02, 04:04 AM
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At operating temp, a 10w-30 will have the same viscosity characteristics as a straight 30w. Its only at cold temps that the 10w-30 will "act" like a 10w until brought up to operating temp. As frank said, a good synthetic like Amsoil or Mobile will give more thermal stability at the high end temps and better cold weather starting too. But if you are on the verge of some mechanical problems Id recommend having your current oil analyzed to see if there are 'wear' problems which might contribute to pressure drops.
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post #4 of 8 (permalink) Old Apr 18th, 02, 04:58 AM
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Has this just started? Or has it always been this way? If it just started you have something going on more than normal wear and you need to look past the brand, wt or type of oil you run!! If it's always been this way then try 10-40 or 20-50 but don't jump on an expensive synthetic unless you find a viscosity change helps.

Some things to watch for, pressure should go up with rpm. At steady rpm pressure should not drop. And it's normal for pressure to be higher when cold. The key is consistancy. If it's doing exactly the same thing it did 20k miles ago it most likely ok...

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post #5 of 8 (permalink) Old Apr 18th, 02, 06:08 AM
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Blk69, I had an '85, 2.8l V6 that got that way all of a sudden. It would have pressure when cold but when warm it would idle at 0 and run at 20 or less. Turned out to be the sending unit.....
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post #6 of 8 (permalink) Old Apr 18th, 02, 07:09 PM
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This topic sparked a question. Is it normal for a 327 (or any similar SB) to drop in oil pressure at idle (around 10-15) and on the same note increase oil pressure at higher RPMs? I guess my question is, what is a normal oil pressure measure at idle for a 327 SB? Anyone's response is appreciated!


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post #7 of 8 (permalink) Old Apr 19th, 02, 02:24 AM Thread Starter
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The engin was rebuilt (professionally) about 2 years ago. It has been doing this for about 6 months. The pressure goes to the bottom of the guage so I have some conserns. I took the valve covers off and oil is still coming up the push rods and I have not increase in engin temperature.

I thought 10W30 acted as a 10 wgt at hi temps. I tried a engin restore project and it did not do anything for my problem.

I think I have a oil pressure guage and I should install it to see if the sending unit is going bad.

Thanks for all your help. I will keep you informed if my engin seases!!!!
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post #8 of 8 (permalink) Old Apr 19th, 02, 05:17 AM
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Wise to verify the existing gauge and sender. The properties of 10w30 are as click describes them... Most engines with stock oiling system will run about 15-25psi warm idle and should climb about 10 psi per 1000rpm. This is a general rule of thumb, not definitive.

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