Hello all, As some of you know, I bought this new Fiero with the supercharged 3.8l V6. The guy I bought it from says he only uses Mobil 1 along with a bottle of Prolong engine treatment every 5000 miles and highly recommends I do the same. I thought, sure, might as well keep putting the same thing he's been putting in it. I'm almost up for an oil change so I went to the store today to buy my oil. Well, Mobil 1 is a synthetic at $5 a quart. A bottle of Prolong (does 1 oil change) is $20. A better oil filter to handle the synthetic stuff is $10. So I'm looking at about $60 for a single oil change. Granted, I should be able to go 5000-7000 miles on one change, but something about it just bothers me. So, I thought I'd post here to get your thoughts on synthetic oil and this Prolong treatment. Is it all a bunch of snake oil? Does it REALLY make a difference whether I use this every 7k miles or use regular oil every 3k? The guy I bought the car from seemed to know what he was talking about, but on the other hand, perhaps he was just sucked into their marketing ploy. I don't mind shelling out the cash for the "good stuff" if it's really that great but don't want to waste my money if it's not necessary. What do you think? ------------------ -Ryan (http://www.ryanwright.com ) Before you criticize someone, walk a mile in their shoes. That way, when you do criticize them, you'll be a mile away and you'll have their shoes.