Low Oil Pressure at HOT idle... use heavier oil?

[renton]

i know oil additives are just a band aid but for a high mileage truck like yours lucas oil additive or something similar may be enough to fix the issue. Cant hurt to try.

 

[Eddo Rogue]

Mine came from O'Reilly. Worked fine and fixed my issue back then (it'd idle at 450RPM and stall).

They do work sometimes. I woulda bought a lottery after that luck.

 

[DILLARD000]

Yep, idle RPMs too low likely adversely effects OilPump pressure & Alternator voltage outputs.
Have V6~4.0L~SOHC here not 4.0L~OHV, but FordOE PressureSensor\Switch is a NotoriousFailureItem no matter the engine.
Over last 20years with this 4.0L & stock oil pressure switch, immediately before an engine Oil+Filter change, gotten habit of
spraying a little CarbThrottleCleaner down Oil DipTube+Fill, then running Engine for 5~10min, then changing Oil+Filter;
believe this helps clear sludge buildup & makes OilPressureSwitch respond a little quicker,
Also switched from OE spec 5w30.Blended to 0w30.FullSyn in Spring & 0w20.FullSyn in Autumn;
believe this helps get oil flowing quicker during ColdStarts, specificly to the PressureSwitch & the notorious TimingTensioners.

 

[ratdude747]

Yep, idle RPMs too low likely adversely effects OilPump pressure & Alternator voltage outputs.
Have V6~4.0L~SOHC here not 4.0L~OHV, but FordOE PressureSensor\Switch is a NotoriousFailureItem no matter the engine.
Over last 20years with this 4.0L & stock oil pressure switch, immediately before an engine Oil+Filter change, gotten habit of
spraying a little CarbThrottleCleaner down Oil DipTube+Fill, then running Engine for 5~10min, then changing Oil+Filter;
believe this helps clear sludge buildup & makes OilPressureSwitch respond a little quicker,
Also switched from OE spec 5w30.Blended to 0w30.FullSyn in Spring & 0w20.FullSyn in Autumn;
believe this helps get oil flowing quicker during ColdStarts, specificly to the PressureSwitch & the notorious TimingTensioners.
View attachment 79061View attachment 79062

I'm not running the stock oil pressure switch setup... I'm running this instead:

Variable Oil Pressure Gauge Modifiction

Original Poster: Larry Bolan (ratdude747) Difficulty: 6 out of 10 (depending on soldering ability) Time to install: 1-2.5 hours Disclaimer: The Ranger Station.com, The Ranger Station.com Staff, nor the original poster are responsible for you doing this modification to your vehicle. By doing...

www.therangerstation.com

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Haven't touched it in the last week... been slammed at work. Will replace the IAC if 3rd party ones are a known issue.