Changed the oil on Friday night. I used some Quaker State Defy 5w-30. That oil has about 1000ppm of ZDDP which you need in engines running flat tappet cams like the '88 351W.
The zinc acts as a sacrificial coating and keeps parts from being worn down. You can also find ZDDP additives but the price was right on that oil. Most newer oils don't have these additives as the switch was made to roller cams and better technology exists to make sure metal surfaces don't rub.
I really like changing the oil on the 351w vs other engines. The oil plug is on the bottom of the pan and the filter attaches to the side of the block at an angle so you don't spill oil everywhere when removing the filter because it mostly drains out! With 31s on it I have more than enough room to get under and work without needing to lift the vehicle which is also nice.
I used a strap wrench to remove the filter as its a little tricky to get in there and get good leverage on it.
I'm not sure what oil was in there or the condition of it. I did notice that my oil pressure gauge doesn't bounce around often at idle when the engine is warm like it was. So maybe the oil was really old and a little sludgy.
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