Is it normal that the dealer where i bought my car 6 months ago called again?

My car dealer who I bought a car from 6 months ago called a few weeks ago to see how I liked my car and if it had any problems. I had called him right after I bought it because it would not fill up gas, and this cost $700 to fix. He did not do anything about it. Out of the blue, he just calls again 6 months later to check-up. I did not think that car dealers care that much and it feels fishy. I feel like there is another motive behind this, though I have no proof, and he was very helpful when I bought the car. I had always believed that most dealers were sleazy, money-hungry people who always wanted you to buy more. I felt like I got lucky with this one. My dad thinks that he may want me to buy another car. He left two messages on my phone, and I have not called back yet. Is it normal that he checked-up one me and do you think that there is another motive behind it? There is no way that I would buy or trade my car right now, as I have $725 in the bank right now.