I found out about this on an oil-specific forum started by some guy named Bob and thought it was worth sharing with my Q brethren.
Pennzoil has a rebate at Walmart through 8/31. Buy a $20 5 quart jug and get a $15 Walmart gift card rebate. These rebates are available via a tag on the 5 quart jugs, and appear to be hit or miss by store. Two per household/person/address.
There's also a rebate good through 11/30 for a $15 rebate check by mail on the purchase of five quarts - so same deal but you get a check instead of a Wallyworld gift card.
http://www.pennzoil.com/docume...m.pdf One per household/person/address.
I have traditionally been a Mobil 1 guy, and still haven't decided if I'll make the jump for the Q and G, but the Frontier has enough oil already stashed in the garage for well into the next decade. The used oil analysis results have been mostly favorable for those that have had it done... and the more I read over at Bob's forum the more confused I get. The consensus seems to be that the two oils (M1 vs. PP) are fairly comparable. You'd never believe how opinionated folks can be about oil but a running theme seems to be that if you're not stretching your OCI too long, most any oil will do.
Heath