I prefer to stick to name brand motor oil. Some guys here use Wal-Mart oil for the cleaning and rinse phrases when they are using Auto-RX but my last cleaning I used Valvoline motor oil. The Valvoline was only about 10 bucks for 5 qts. in a 5 qt. container.
The last time I checked at Wal-Mart it looks like Pennzoil Platinum has gone up a lot so I think I will use Motorcraft 5w30 semi-synthetic. But I think I will still use Pennzoil Platinum in the wintertime. For an Auto-RX cleaning and rinse I think Valvoline works pretty nice, especially if you can get it real cheap.
The last time I checked at Wal-Mart it looks like Pennzoil Platinum has gone up a lot so I think I will use Motorcraft 5w30 semi-synthetic. But I think I will still use Pennzoil Platinum in the wintertime. For an Auto-RX cleaning and rinse I think Valvoline works pretty nice, especially if you can get it real cheap.