My mother's 97 Ford F150 with the 4.6L V8 is up for an oil change in a week or so. Up until now we have been running Maxlife 5w-30 in it and it seems all is well. It has about 106k miles and burns around a quart every 3000 miles. This engine has been back-specd for 5w-20. Considering this, and the winter coming up we are planning on switching to a 5w-20. We have narrowed it down to keeping it on a diet of Maxlife just switching to 5w-20 or Motorcraft 5w-20 semi syn. I know MC is cheaper, but price is not an issue because we have been paying for Maxlife all along. Maxlife is a Group 2/3 mix, 30% G3 I think. I'm assuming Motorcraft is a Group 2+? I was thinking the additive package in the Maxlife might be more robust. Also, I looked at both of their viscosities and they are about the same. We always change the oil between 3k and 4k intervals, it sees severe service in stop and go traffic. Thanks for the input everyone.