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If the check engine light is on have it checked ASAP! Could be something as minor as a loose/faulty gas cap to something much more serious.
As for oil change intervals & oil type, what does the chassis manufacturer recommend? Whatever that is is what I'd do.
Quite honestly never heard of using mineral oil in an engine???
Myself, unless the manufacturer recommended synthetic oil, I couldn't tell much difference other than it cost more, no noticeable improvement in mileage or performance. Also if you read closely you should not extend oil change intervals when using synthetic oils.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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