My car has approx 55k miles. It's a weekend toy and is mostly stock except for a moderately big camshaft. My local Wal-Mart Stocks Pennzoil Ultra in 5 qt jugs for 27.00 and M1 for 25ish every day of the week. They also stock Fram ultra filters. My local Advance Auto is always running a great deal on oils but varies month to month. I used to use GC back in the day...but only some AutoZone's here had it on occasion and it rarely went on sale so I switched to Pennzoil Platinum and then Ultra. The last time I changed the oil (probably 2 years ago) I used 6 qt. of Ultra 5w30 and a WIX 51522. Although I'm sure it's still a great oil, it's my understanding Pennzoil Ultra SN isn't as good as the SM was. Someone correct me if I'm wrong. I went by Advance Auto to see if they were running an oil/filter deal and get a jug of Mobil 1 0w40 and a Fram Ultra filter as recommended to me by a member on here and LS1tech.com. Right now they're having a deal on Castrol Edge Syntec which includes the 0w30 Euro Formula. 5 quarts for 32.99 plus a free Pure One filter or pay 2.00 more and get a K&N or Fram Ultra filter. Plus they give you 10.00 back in a rebate card. Most of the qts are made in Belgium, but they have several that is made in Germany. Is the 0w30 still as good as it used to be and does it matter whether it's from Germany or Belgium anymore? If so, should I stock up on this while there's a deal or would it be worth it to switch to M1 0w40? Also, of the 3 filters, which is the best? If the Castrol is still good stuff I'll switch back to it...especially at this price. If the M1 is better I'll switch to it and stock up when there's a sale on it in a month or two.