Bro,
I bet you have a galley plugged or something blocking the oil bc of that high mileage oil, it has additives that help plug seal leaks.
Get the following, if I recall the 5.7 holds 5 quarts:
Walmart
-4qt bottles of cheapo dino oil (use this to clean engine)
-5qt of cheapo dino oil (use this after)
Autozone
-Oil filter
-1 bottle of GUNK engine cleaner (I actually used 2 bottles, just be sure and take out about a quart of oil for each bottle bc you don't want more than 5 or 5 1/2 quarts of fluid total .....SO: 5quarts = 3qts dino + 2bottles of Gunk)
The GUNK engine flush is kerosense iirc, which is basically a stronger version of what most people do with Seafoam treatments. If you can afford it, I would add a bottle or 2 of Seafoam with the 2nd oil change to thoroughly rid yourself of that high mileage oil garbage.
With the engine cool
1) drain the high mileage oil out
2) reinstall drain plug
3) add the Gunk engine cleaner
4) add 3 or 4 quarts of dino oil depending on how many bottles of gunk
5) Let the engine run for 3mins
6) rev rmps up to 1500 a few times
7) after 7-10mins, turn engine off
8) drop oil again
9) add fresh dino oil
10) drive
B
