Car had trouble starting on 2003 Infiniti G35

My car had trouble starting the other day. It was parked on a sloped driveway for about a week and when I tried starting it today, it took about 10-15 turns for it to finally start. I'm thinking maybe the car is low on oil. Could this have anything to do with the car being parked a slope?

Asked by for the 2003 Infiniti G35
oil or fuel if tank was very low when parked a week ago
1 more answer
First how much fuel was in the tank? What did the gauge register? Do you have any check engine lights on?