I want to know if anyone is using a different 4 stroke oil than the Suzuki oil for Suzuki 4 stroke oil changes? The owners manual is saying to use 10w - 40 Suzuki oil. But, the local dealers are completely out of stock. There is one dealer that wants 8.50 a quart. I need 17 qts. Compared to a Mobil one oil that is 4.50 at Wally world.

Or I have been looking at Mercury 4 stroke oil semi syn (20w/50). Has anyone been this?

Thank you in advance.