Intermittent oil light at start up - Diesel Forum - TheDieselStop.com
6.4L Power Stroke Engine and Drivetrain Discussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.

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post #1 of 4 (permalink) Old 04-20-2017, 05:33 PM Thread Starter
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Intermittent oil light at start up

I have a 2008 f250 6.4 with 99k on it. Runs great but when first started the oil lamp comes on for a half second. Do not remember ever seeing that previously. Oil is full. Should I be concerned and what could be causing this? Never comes on again after it is running. Just for a split second when first started. Any help would be appreciated. Love this truck and do not want to hurt it.
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post #2 of 4 (permalink) Old 04-20-2017, 07:05 PM
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Originally Posted by gregslife51 View Post
I have a 2008 f250 6.4 with 99k on it. Runs great but when first started the oil lamp comes on for a half second. Do not remember ever seeing that previously. Oil is full. Should I be concerned and what could be causing this? Never comes on again after it is running. Just for a split second when first started. Any help would be appreciated. Love this truck and do not want to hurt it.
I had the same issue and what fixed it for me was replacing the aftermarket oil filter plastic housing with an OEM version. I swore that wouldn't make any difference, but several reputable diesel mechanic friends told me that try it and sure enough it worked. Comparing the two side-by-side I couldn't tell you what the difference was, but damned if it didn't fix my issue.

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post #3 of 4 (permalink) Old 04-21-2017, 09:41 PM
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I think the after-market filter/housing cap is allowing draindown of oil after shutdown--based on diode_ee post, that is probably the problem. Only use Ford/Motorcraft filters and OEM caps/housings--there is a difference. And on the fuel filters also--if you ever get a no-start after changing the fuel filter with anything other than a Motorcraft, then immediately replace with MC and bleed air off.
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post #4 of 4 (permalink) Old 04-22-2017, 06:15 AM
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Originally Posted by wingnut60 View Post
I think the after-market filter/housing cap is allowing draindown of oil after shutdown--based on diode_ee post, that is probably the problem. Only use Ford/Motorcraft filters and OEM caps/housings--there is a difference. And on the fuel filters also--if you ever get a no-start after changing the fuel filter with anything other than a Motorcraft, then immediately replace with MC and bleed air off.
That was my thinking on what was causing the light. The difference is very slight as it wasn't evident when comparing then side-by-side

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