I'd like to add a question to the 20 vs 30 discussion.

2004 Ford Ranger 3.0. For most of its life, Motorcraft 5w20 synthetic blend supplied by the customer. For the last 2 years, 5w30 Mobil 1 Synthetic. Change from 5w20 to 5w30 at about 150k miles. Truck now... Login to read more.