I own an older model Toro 20622 ( serial # 6036609)with the Suzuki engine with BBC;
21' rear bagger, self propeled ( 3 speed)
no issues with the engine , no oil leaks or power loss ( I use syndetic oil, change regularly)_
has grease fittins on the rear drive wheels
Original owner- have full parts manual
Transmission has an issue and have not yet located a source for a replacement transmission -
gear case assembly part #46-3581
Availabe for sale