John Deere S120 Review

S120 review

Why the S120 is the step-up 100 Series tractor

The John Deere S120 is the one to read about if you want the most capable lawn tractor in the S-series without crossing into the bigger 200 Series. It pairs the same 42-inch Edge deck with a 22 hp V-twin, which is the biggest single change from the single-cylinder S100 and S110. It also brings the Easy Change 30-second oil change system.

Deere describes the engine as a 44.2 cubic inch (724 cc) overhead-valve V-twin with cast-iron cylinder liners, electronic ignition and full-pressure lubrication. For anyone mowing a larger yard or dealing with thick turf, the extra displacement is the reason to pay more.

V-twin power and smoother running

A two-cylinder engine usually runs smoother and holds speed better under load than a single, and that is the practical benefit here. Mowing damp grass or taking a full-width pass through heavy growth is where an S120 owner is likely to notice it over the smaller models.

The tractor weighs 444 lb without fuel, about 30 lb more than the S100 and S110, and it stands 44 inches tall. Fuel capacity is 2.4 gallons, mounted at the rear, with a gauge on the dash.

Easy Change oil, RIO and daily use

The Easy Change system is a sealed filter-and-oil cartridge that lets you swap oil in about thirty seconds without tools or mess. For many homeowners, the missing step in lawn-tractor maintenance is oil, and this removes the excuse.

The Reverse Implement Option lets you back up with the deck engaged. Combined with a hood with molded-in color, a QR code on the fender that links to manuals and maintenance schedules, and Equipment Mobile app compatibility with an optional smart connector, the S120 feels like the most modern of the three.

Drive, deck and hauling

Drive is the same Tuff Torq TLT200 hydrostatic as the cheaper tractors, with side-by-side pedals, 5.5 mph forward and 3.2 mph reverse, and wet disc brakes. The 42-inch deck offers 13 cutting heights from 1 to 4 inches and 3-in-1 blades. Towing is rated at 500 lb.

The seat has a 15-inch back, coil springs and 5.5 inches of fore-aft adjustment, with no armrests. A storage tray with a cover and a cup holder are included. There is no receiver hitch, taillights or 12-volt outlet.

Is the S120 worth the extra money?

If your lawn is above an acre, includes slopes or has thick grass, the V-twin and the oil system are worth the difference over the S100. If your yard is small and flat, the base model is cheaper and cuts just as cleanly. The 2-year or 120-hour warranty is identical across all three.