opinions wanted; car sales gone bad

You cannot foresee some hidden, developing problem

But, but, but, but.... you mean a car needs no maintenance? You mean you just can't put the key in and drive it and never have to actually do things like check tire pressure, etc?

You mean the current owner actually has to take responsibility for owning the car?

I get this all the time. Car comes in, I look the car over, advise the customer of needed repairs, warn the customer of something which may need to be looked at in the future, do the needed repairs, and three weeks later something else pops up that has nothing to do with the repairs I did and it's suddenly my fault. Like I'm Harry Potter and waved my magic wand over the car and took care of everything that might go bad with the car ever.

Sounds like the buyer of this car is the same way. It's been three months since the buyer bought the car. Tell him to go kick rocks. A lot can happen in three months. It needs new tires? Big hairy deal. How's that your fault three months after the sale, especially in light of the fact you told him it had worn suspension components?

In three months the worn struts were supposed to fix themselves without him having to actually purchase new ones?

In three months the oil consumption was supposed to get better, not worse, without actually taking a look to see what was causing the oil loss?

I see in the email he sent you he's doing a lot of complaining with no explanation as to addressing the current problems. If he was serious about trying to hit you with something he'd have said: "total cost for repairs: $XXXX. I'll see you in court." No, he's hoping to guilt trip you into fixing the car, after a $1200 three month old sale and hoping that by mentioning the proper authorities he'll scare you into doing it.

Ask him what part of "as-is" doesn't he understand. Then ask him what part of "owner responsibility" doesn't he get.