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Discussion Starter #1
I changed the oil to 10w-30 synth. and I noticed at idle the pressure drops to around 25lbs. I can't say I ever noticed this before.
There has been a heat wave in NE, but I don't really think this would do it.
Is it normal for oil pressure to drop at idle and I just haven't noticed?
Someone else has experienced the same condition.
 

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Knight, I'm running Mobile 1 10-30 and my pressure drops to about 25 psi at idle when the oil is running at cruise temp.(about 100 C). I don't think there's anything to worry about. I have a 351 with the standard oil pump.
Ergie
 

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10W30 mobil1 in my heap and it sits between 25 and 30 PSI at idle. Pretty much normal for a small block ford. As long as you're up in the 50+ range when you're really cranking, it's probably ok.
 

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Discussion Starter #5
This is good news! I was running straight 30w dino oil and I think it stays a little higher at idle. I was driving my work truck and I noticed the oil gauge never moves. It's just a needle gauge with a picture of an oil can. This made me concerned.
Thanks!

[ June 15, 2005, 09:29 PM: Message edited by: Knight ]
 

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FFCobra Craftsman
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Many newer vehicles have an oil pressure gauge that never moves. When the engine is operating within normal pressures, the gauge stays at the same place on the gauge. Many owners were concerned that their oil pressure was running rather low at idle, and very high at higher engine speeds. Rather than try to explain to people how it all works, the gauges were set up this way. Basically an idiot light that looks like a sporty gauge.
 

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Discussion Starter #7
Today the engine was hot and the outside temp was hot. Oil was at 90c and the pressure seemed low. Below 20lbs on the gauge.
Even crusing in 5th gear the pressure was about 25 lbs. It goes up with rpm.
Could it just be the oil weight and type?
When the oil is cold, all is fine. But the oil just seems to be too hot and thin.
 

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It's just fine Bill...

Today's oil is so much better than the oils we had even 5 years ago, it's like night and day..

Just remember one thing;

Oil Pressure is excess capacity of oil being supplied to the bearings. Within reason - any pressure at all shows that you have an adequate supply of oil to those surfaces that require it.
We are not "Floating" bearings - we are simply lubricating bearing surfaces and carrying away heat.
 

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Ford specs. At 2000rpm oil pressure for stock engine should be 40-60psi.
 

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25lbs @ an idle is plenty. Buff runs around 40, but I bucked the cajoling wisdom of the forum gurus and installed a HV/HP oil pump.
 
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