Mixing oil question
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From: Bossier City, LA
Mixing oil question Kinda dumb question, but I figured I'd ask anyway. Can u mix the oil weight? I'm running 10w30 royal purple and since I install the bigger 34" radiator with a built-in oil cooler, the oil pressure has dropped close to 5psi and when it's hot it's idling at 30-35 psi. Motor is a 383 ls1 with a FMS ported oil pump. I've seen where royal purple seems to not run oil pressure as high as some other brands anyway.
I bought a bunch of the 10w30 and was wanting to know if it's ok to run 3 qts of 10w30 and 3 qts of 10w40 on the next oil change? I don't think you're supposed to, but thought I would ask. Would it give a little more pressure? Thanks.
I bought a bunch of the 10w30 and was wanting to know if it's ok to run 3 qts of 10w30 and 3 qts of 10w40 on the next oil change? I don't think you're supposed to, but thought I would ask. Would it give a little more pressure? Thanks.
So you have 200* coolant in the radiator trying to "cool" the oil? Hmmmmm.
You should use an external aftermarket oil cooler. Oil pressure is down because its too hot. Thats my guess anyway...........
and yes....mixing oils is perfectly fine. Just don;t ever mix different grade tranny fluid.
.
You should use an external aftermarket oil cooler. Oil pressure is down because its too hot. Thats my guess anyway...........
and yes....mixing oils is perfectly fine. Just don;t ever mix different grade tranny fluid.
.
What size hose/piping did you run between the cooler and the engine? If it is too small for the distance involved the oil pressure will drop.
Thread Starter
14 Second Truck Club
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From: Bossier City, LA
I'm running the stock oil cooler lines, radiator and fan set-up from a 2005 silverado 2500. Everything was brand new btw. My truck is a99 silverado. I think the oil cooler lines are 1/2"...
How long are the oil lines from the engine to the radiator/cooler (approximately)?
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I would check the pressure with a mechanical gauge to make sure it is just not your gauge (sensor and grounds.)
If the problem persists, you might try disconnecting/bypassing or otherwise plugging the oil cooler plumbing to see if that helps. If it does, you could look at replacing the 1/2 inch tubing (equates to -8 AN) with some -10 of -12 AN.
In long run, you should not have to mix oils.
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Don't worry about mixing the oils together as you're not going to gain much, if any, pressure by blending them. Change completely to the 10W40 if you feel like you need it, but with 30 to 35 psi at hot idle, you're more than fine. 
