1 Material and labor for a wood retaining wall runs approximately $20-$25 a square face foot (and there's usually a minimum charge for small projects), which would be about $1,000-$1,300 for a 50-square-face-foot wall. Materials and installation for a stone retaining wall start around $25-$40 a square face foot and go up depending on materials, site conditions, and other factors.
MFWD (mechanical front wheel drive) or front wheel assist tractors generally have smaller tires on the front and the front axle can be mechanically disconnected from the rest of the powertrain in some manner or another.
The L130 lawn tractor's factory specifications call for John Deere's Hy-Gard J20C or J20D transmission oil. The company recommends using only Hy-Gard oil in the lawn tractor. John Deere J20D is a low-viscosity transmission/hydraulic oil, while J20C is a high-viscosity product.