- Nov 8, 2012
Since I bought my pennzoil gold I noticed a week later on a return trip to Walmart the price difference between the full syn (Castrol magnatec) and semi syn (pennzoil gold) is virtually non existent. For a 6k interval do you think there is that much difference for a buck or two? Can a pennzoil semi syn be as good? Or is it foolish to buy a 50% synthetic? Just curious.