rayra
Expedition Leader
Were you in neutral when trying to go to 4L?
Looks like a rear main to me, I'd walk.
rear main wouldn't have oil all upside the main part of the oil pan. Those are cast aluminum pans, should be silver matte in appearance, not looking like a seasoned iron skillet. That's coming from above. And even that's not difficult to change if you are in far enough to drop the pan.
My advice if it is bought is to thoroughly degrease all that crud BEFORE you do an oil change. The dirty oil will make it easier to spot where the oil is seeping down / out from.
Too, take care blastign water around the throttle body, the valley pan cover is where the two knock sensors are located and it's a typical rust / loss of signal problem especially with the rear most sensor. That happens and the vehicle goes into 'limp' mode. Plenty of pics and details about that in my Vortec topic too.
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