What engine oil should I use in the Bobcat 250 at initial setup?
The unit is shipped with 10W30 engine oil. You should check all fluids daily with the engine cold and on a level surface, and do not exceed the 'Full' mark on the oil level dipstick. Use the correct grade oil for cold weather conditions to improve cold weather starting. (Page 18)
From the official Miller Bobcat 250 Portable Welder Generator manual, page 18
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