Hi I have a old Briggs engine on a wheel horse from 1978/9 after spending a fair amount on the engine I decided I would change the oil but I could not see he oil filter does it have one ? I presumed it did as the engine on my mtd does in addition there s no oil dipstick just one of those screw caps that says fill oil so how much do you put in? do you fill it to the brim? thanks in advance