Got some Pennzoil Conventional and a Napa Proselect all ready for my silverado. After trying to solve the ticking problem, I wanted to use Pennzoil conventional because everyone loves it so much. What can I expect as far as "CLEANS OUT UP TO 40% OF ENGINE SLUDGE IN THE 1ST OIL CHANGE" ? Planning to keep it in for 3K miles. It seems like Pennzoil Conventional does very well particularly in chevrolets. Thanks!