I know this is an old thread but I normally would change my own oil and use 5w-30. This week I had my 2019 Thor Ace 29.3 at the Ford truck dealer for other service so I had them do the oil change. When I came home and checked the bill I was surprised they used 5w-20 oil.
My manual does say to use 5w-20 and 5w-30 is optional.
My next change I plan to use 5w-30 again. My fault for not telling them up front to use 5w-30.
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