Here’s my opinion. If you don’t use Top Tier gas, you’re unlikely to have a detergent-related engine problem. If you do use Top Tier gas, you’re even less likely to have a detergent-related engine problem. If it’s available at the same price, then you might as well use it. If not, then I wouldn’t lose sleep over it. Keep in mind that many of us don’t have it available where we live.