I should add, I recently went from conventional Valvoline 10W30 to Valvoline VR-1 10W30. I am now curious if changing oil for the winter with conventional would be fine? It gets driven 10 minutes to the storage unit in the fall and 10 minutes back home in the spring. Would be way cheaper, just wondering if it would be fine. Ran conventional in the engine for 10 years before switching.