[Flyboy1st]

Best set up for a clean non sludge Model A engine is a 160 thermostat, Mobil One 5W30 full synthetic oil and a cam cover full flow oil filter. Change every 3000 miles or every six months, combustion causes acid so the time change of the oil. Also always let it get up to the 160 degree temp to evaporate moisture, don't let it sit and idle needlessly. In my area, Virginia, that oil and filter runs about $40, pretty cheap insurance for a restored 91 year old engine, love these old engines!