Oil Pressure Drops When Warm - Hemi Truck Club
 
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Old 09-08-2020, 01:28 PM   #1
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Oil Pressure Drops When Warm

After engine is warm, oil pressure indicator starts to oscillate and drops to zero. My truck has been parked over a year and before starting it, I change the oil, filter and added a can of Seafoam to clean and flush the oil system.
However, when engine warms and oil pressure starts to oscillate, I notice valve lifters knocking. If I turno off the engine for while and start it again, oil pressure comes to normal again and valve lifter sounds disappears for a while. If I press the gas pedal, problems seems to worsen.
The oil removed was very dirty and kind of sludge. That’s why I opted to use an oil flush product.
I have three theories in mind:
1. The Seafoam thinned the new oil too much.
2. There is oil sludge in the oil pan that blocks oil pick up screen.
3. The oil pump is busted
Your expertise is highly appreciated. Thank You!!

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Old 09-08-2020, 02:49 PM   #2
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Because you have lifter clatter associated with the low oil pressure I believe this to be a genuine oil pressure issue. I'll agree with the pickup becoming clogged. For peace of mind I would drop the pan to inspect the pickup screen and clean out the pan.
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Old 09-08-2020, 09:38 PM   #3
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Put a mechanical guage on it and see what your have for actual pressure cold and then hot. If that ends up being low then remove pan and inspect screen for a clog. If acreen is good then you likely have a bad oil pump and this could in turn have damaged the lifters also from lack of oil
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Old 09-09-2020, 06:29 PM   #4
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Thank you for your expedite feedback! I will proceed with a pickup screen inspection and pray I will found it clogged... If not, then I will take care of the oil pump... I'll keep you updated for results!
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