oil light staying on

[blurider2]

Went on my first sled trip with my turbo nytro trailered for 2 hours -8c stop to unload sled,started it up and oil light came on would not shut off, stopped engine and restarted light still on, stopped engine again checked oil level, good started it again and all is good rode for 6hrs no problem next morning same thing. Sled normally sit in warm garge start it up oil light goes out no problem.