I have a 2000 1.8t that spits and sputters about every 6 months letting me know that the plugs are sucking. My question is, My turbo is out and i still burn 93 octane. Does this or can this be the reason it eats plugs about every six months. Should i use regular 87 or could that be the problem at all. Right now i can't afford to get the turbo fixed??