Question on oil change- Murray 14.5 ohv briggs Riding Mower?

I have a 2nd hand murray lawn tractor %26amp; want to change the oil - (no manual) - looking at the motor, there is what looks like a drain plug bolt at the bottom of the long filler tube where you take the cap off %26amp; check the oil level. I don't see an oil filter. Whats involved in changing the oil, do I just unscrew that metal drain plug, let it all drain out, then refill thru that measurement tube? How much oil %26amp; what grade/viscocity? Anything else I should know on changing this oil? (no filter correct?) Thanks for anyone with experience on these murray 14.5 briggs motors (it is a 2000 model year).Question on oil change- Murray 14.5 ohv briggs Riding Mower?You are correct on the draining and filling. Use 30wt oil and it will take about 3 pints of oil. Don't fill it above the full mark on the dipstick. If there was an oil filter it would be on the same side of the engine as the dipstick and very obvious. Engines that size usually don't have filters. Change the oil every 25 hrs or at the beginning and end of the season.Question on oil change- Murray 14.5 ohv briggs Riding Mower?be carefulQuestion on oil change- Murray 14.5 ohv briggs Riding Mower?i have a 12 hp and you drain like you said no filter 1 qt straight 30 wt oilQuestion on oil change- Murray 14.5 ohv briggs Riding Mower?You are correct on the oil change procedure. Drain completely and refill with approx 1qt of 10w30. Check your dipstick when the qt is almost gone to ensure you do not overfill. There is no oil filter on a 14.5 Briggs.