1999 Ford F150 is losing oil

1999 FORD F-150
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SOUSADAD
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2 days ago, my 1999 Ford F-150 4.2L V6 started losing oil on the driver's side of the block somewhere. I haven't had a chance to look closely, but is it possibly the OSU, if the oil is coming from that area? It is coming from somewhere above the oil pan seam for sure. The engine was running good when last turned off. The next morning, oil was discovered on the driveway under that side. Looking for a starting point.
Jan 9, 2006 at 3:35 AM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Have the damaged filter replaced with the correct part, verify the oil level and check for leakage afterward. Investigate further if the leak continues.

Guidance references and applicability

Source: This question and its visible discussion. Owner reports are distinguished from other participants' experiences. Follow-up guidance is not a confirmed diagnosis.

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AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
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CHOFFMAN41
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I don't remember where the sending unit is on a 4.2, but I have seen them leak oil where the plastic is crimped to the metal so that sounds like a good place to start........
Jan 10, 2006 at 3:11 PM
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DUDE
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double check its not the oil pan gasket , had it happen once
Jan 10, 2006 at 4:43 PM
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SOUSADAD
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For information's sake, I found something surprising. My oil filter had a crack in it. First time for me with this problem. What seems weird is that the filter had been on there for 2000 miles but just start leaking. Thanks for the advice.
Jan 11, 2006 at 4:21 AM

Discussion summary

1999 Ford F150 is losing oil

The owner of a 1999 F-150 4.2 reported an oil leak above the oil-pan seam and initially suspected the sending unit. In the final update, the owner identified a crack in the oil filter.

Reported outcome: The owner identified a cracked filter; replacement and a subsequent leak-free check were not documented.

The reason the filter cracked after being in service was not established. Earlier sending-unit and pan-gasket suggestions were not confirmed.

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AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
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