I would NOT think of selling it if you like the car.
Remember that *IF* you have the problem you THEN can worry about it.
$900 is only a few months of "normal"
peoples car payments.
As someone who had a car with one of the most reliable engines that Ford has EVER made need head gaskets @ 61k and 108k. I fixed it both times at around $1200 for the first time and $800 the 2nd time.
Ended up selling the car as I needed something to get better MPG but the friend who bought it from me is happy with it as it is passing 160k miles. (will not talk about the POS transmission)
Just do the following on your car.
1. Change the oil (
ANY oil is fine as long as it meets API-SL/SM 5w-30)
2. Use the CORRECT size filter. Do not worry about oversize.
3. Get a UOA here and there to follow the engine just *IN CASE* something pops up.
Again, *IF* something comes up deal with it and get down the road.
Plain oil, no additives and enjoy the car!
Take care, Bill