Currently running Rotella 30w in all the lawn equipment, which is all Briggs engines. I have a 3.5 push mower, an older 3.5 tiller, and a 14.5 I/C in the Murray rider. I have a couple gallons of it, should last almost forever.
2 strokes are getting Quaker State 2 cycle oil I got at a rummage sale 2 summers ago.