Conventional and Synthetic Oils

When I bought my used sleds, the previous owner gave me 4 gallons of conventional 2 cycle oil. I’m getting to the end of those 4 gallons and want to switch to synthetic. Can I just start topping off the oil reservoirs on each outing with the synthetic or should I run the reservoir down to almost empty? Are there any issues with mixing conventional and synthetic 2 cycle oils?

Thanks guys! Call me Sir Mix A lot!

I agree with Fowler, no problem... I've done the same with my sleds and outboards over the years.

Mixing the two is basically a blend available on the store shelf. When I transitioned from a ash grade to synthetic I just starting topping off the tank with synthetic like you assumed doing. I've done the same with wheelers, jet skis... No issues to speak off.