[bluesfan]

Originally Posted by IndyIan

Bluesfan, 5W30 will work fine in your truck, and 10W30 will be fine in the summer. Thicker oil does decrease mileage slightly but synthetic oil increases mileage plus is a better lubricant, so going from normal 5W20 to 5w30 synthetic won't affect you very much.

Thanks for this IndyIan -- I'll keep it in mind!