I purchaced 9 qts of QTP from W*M on closeout in early spring 09 and am about to use it on the next OCI. Of the 9 qts, 3 are 5W30 and the other 6 are 10W30. Has anyone had any experience with QTP and would you like to comment. NOT QHP but QTP! Looking forward to hearing your reviews and please mention your vehicle, engine and OCI/mileage