Hi All - I only use the Unleaded Plus on my 99 STS because the dealer I purchased it from said to do so. Well, I understood from some folk that when using regular, and you need to JUICE it really good to get past traffic, you'll hear a gurgling, valvy-like knocking. Well, I use PLUS and when I need to pass or REALLY get on it, (or if I just want to), it sounds like knocking. This can NOT be good! Any ideas? I've had it for 2 months now, and it has 114000 miles on it, which the reviews indicates that is good!
Thanks for your help...
Thanks for your help...