I've been lurking the boards for a few weeks, and have learned a lot. What a great board! I have a 92 Explorer 4.0 OHV engine with 165,000 miles (bought new in November 1991). I need to get a few more years out of it. Currently it is used as a typical soccer mom-mobile. Lots of short trips. Just a short history. The engine had a steady diet of Mobil 1 5w30 until about 90,000 miles, with 5000 mile OCIs. Then I switched to Pennzoil or Valvoline 5w30 dino, maintaining the 5000 mile OCI. At about 140,000 miles (about 3 years ago) the engine started using a quart between changes. Then 2. And now 3+. Have the dino oils been shearing down to a 20w and causing the oil consumption to increase? Ford does not recommend 5w20 oils for this motor. So I need a shear stable oil. I just put in Havoline 10w30. Will this fit my needs? I have used 10w30 oils before, but the engine seems to labor in the winter until the oil warms up. Are there any shear stable 5w30 dino oils? Any other advice/comments?