a guy (original owner) has his 90 300zx twin turbo up for sale it has 60k on it 5speed t-tops all stock just had its 60k service done he says he always let the car run before he shut it off and no blue smoke at all he will sale it to me for 9,000.00 the car is mint garaged all of its life i dont think he will go any lower does this sound like a good deal? thanks for any help you can give me.....and also would it be a good ideal if i get the car to switch over to synthetic oil