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88 5.0 oil pressure issues

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Old 06-05-2018, 06:52 AM
MHBronc93
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88 5.0 oil pressure issues

Recently I seem to lose oil pressure when the engine has warmed up and I'm either slowing down or stopped completely. I have the oil pressure switch I just need to install it. Also the oil is old and I need to change it. Could changing those solve my issues or is it something bigger?
 
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Old 06-05-2018, 09:32 PM
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My 1990 5.0L Bronco loves the straight 30W oil, the lighter oil seems to burn off quicker than the 30W. While not losing any of the power from using a higher 40W oil.
 
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Old 06-06-2018, 09:18 AM
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You know the oil is old, change it. If you are still concerned about oil pressure put a real oil pressure gauge on.
 
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Old 06-06-2018, 01:17 PM
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My '85 (EFI) 302 has the same issue going on. Oil pressure is just fine while driving, but after it's warmed up, and I'm stopped, it drops to 0.
I've changed the oil and filter, tuned it up, etc, but it doesn't seem to make any difference.
I do wonder if it just has really sensitive gauges / oil sender or something since even when it reads 0, it idles smooth and there's no noise. If there really was 0 oil pressure, there'd be some sound coming from the engine, like lifters clacking or something.

Granted, you definitely want to do your diagnostics since you don't want to just convince yourself it's okay, and then have it burn up. A real oil pressure gauge would be a good start.
 
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Old 06-07-2018, 11:58 PM
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Any engine is going to have lower oil pressure after it warms up. It has to do with the mechanics of materials, the steel gets warmer and it expands, Holes get larger than journals do, so your crank journal clearance and your rod bearing clearances get larger and the oil has a easier time flowing out of those areas. Additionally the oil viscosity gets lower so the fluid oil moves thru tight spots easier, all these add up to decreased oil pressure on the gauge,

One solution is to use a higher viscosity oil to begin with. A search for oil nomenclature will give you the details on oil viscosity and the oil labels.
 
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Old 06-08-2018, 11:27 AM
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only use a motorcraft, wix or purolator oil filters. 10w40 oil of your choice . I like using Delo 15w40 diesel oil. the high zinc content is great for the motor and the oil does a great job of keeping the motor clean between changes.
 
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