My 2013 Craftsman t1000 (247.203700) riding mower has a discrepancy between the manual and the actual markings on the engine. The manual calls for straight 30 weight oil or 5w-20 in frigid conditions. Two stickers on the engine, along with the cap on the dipstick itself, indicate 10w-30. This is the Chinese 420cc engine. Has anybody experienced this or know which it should be? Thanks for any help.