Re: 10w-30 instead of 5w-30
You'll definitely want to change that out before it gets cold.
It's all 30 wt when its at operating temp, but 10W is more viscous when it's cold, and takes longer to get moving.
This is where you get more than 90% of engine wear.
I wouldn't use 10W oil in any engine.
'89 EB BroncoII, 2" body/3" suspension lift by Duff. D35 front/8.8 rear swap, Camcraft cam, Pacesetter headers, 4.0 radiator,P235 75 15 Michellin LTX