Pressure of oil
Thread Starter
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Junior Member
Joined: Dec 2011
Posts: 6
Likes: 0
From: bolivia
Pressure of oil
Hello, it is the second time that I come to you and this time I do the effort to write my question in English (so so), been grateful by the first consultation that I could solve, I hope that you could help me once again, thank you.
I have a F-150 5.4 mod.2000, with 100.000 miles and the problem that I have is when I ignite it at the morning it doesn't have pressure of oil until the engine warms and newly in this moment it rises the pressure and is kept normal. If the engine cools totally it turns the same problem. The oil that use is AMALIE 10W-40 synthetic and filter FRAM. Thanks again.
I have a F-150 5.4 mod.2000, with 100.000 miles and the problem that I have is when I ignite it at the morning it doesn't have pressure of oil until the engine warms and newly in this moment it rises the pressure and is kept normal. If the engine cools totally it turns the same problem. The oil that use is AMALIE 10W-40 synthetic and filter FRAM. Thanks again.
Senior Member
Joined: Jul 2004
Posts: 6,200
Likes: 39
From: Easton, Pa.
My reply is based on two of your discriptive items.
That the truck has 100,000 miles and the oil being used is 10w40.
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Do the the mileage, check the actual oil pressure performance with a pressure gage at the sensor port to see what you actually have.
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Next, excess wear may have already occurred due to using the 10w40 oil weight.
The oil weight called for is 5w20.
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Some filters have a drain back issue so may delay pressure build.
The heavier oil does not help this either.
.
The lighter weight oil gets pumped much faster than the heavey weight.
Another reason to use the lighter weight oil is the camshaft chain tensioners are tensioned by oil pressure. If heavey weight oil is used the tension may not build as fast then when it does the tension on the chains becomes excessive until the oil thins from higher engine temperature.
.
Using heavier oils in todays overhead cam engines, thinking there is a benifit, is old thinking that has no basis.
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In reference to the above for oil, my truck now has 167,000 miles.
With full time oil pressure gage, the pressure at startup is 75 PSI and running hot idle is 25 PSI. The oil is Motorcraft 5w20, Motorcraft 820 filter. Change intervals has been 5 to 6000 miles.
Good luck.
That the truck has 100,000 miles and the oil being used is 10w40.
.
Do the the mileage, check the actual oil pressure performance with a pressure gage at the sensor port to see what you actually have.
.
Next, excess wear may have already occurred due to using the 10w40 oil weight.
The oil weight called for is 5w20.
.
Some filters have a drain back issue so may delay pressure build.
The heavier oil does not help this either.
.
The lighter weight oil gets pumped much faster than the heavey weight.
Another reason to use the lighter weight oil is the camshaft chain tensioners are tensioned by oil pressure. If heavey weight oil is used the tension may not build as fast then when it does the tension on the chains becomes excessive until the oil thins from higher engine temperature.
.
Using heavier oils in todays overhead cam engines, thinking there is a benifit, is old thinking that has no basis.
.
In reference to the above for oil, my truck now has 167,000 miles.
With full time oil pressure gage, the pressure at startup is 75 PSI and running hot idle is 25 PSI. The oil is Motorcraft 5w20, Motorcraft 820 filter. Change intervals has been 5 to 6000 miles.
Good luck.
Thread Starter
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Junior Member
Joined: Dec 2011
Posts: 6
Likes: 0
From: bolivia
problem solved after waiting and waiting to arrive motorcraf filter, try different oils and does not achieve anything lower the carter and the problem was a valve that has the oil pump is locked, clean and fix the problem. thank you very much.
