Peace of mind. When you want the ultimate in premium protection, go for FORTRESS™, from Briggs & Stratton and United Engines. Backed by the industry’s longest parts, labor and travel 6-year limited warranty, Briggs & Stratton’s Fortress line comes standard with an oil warmer to ensure your generator starts every time, even in the chill of winter. We can now offer the 10 year warranty free to every customer that buys from select 12kw-20kw models. As if the already great 6 year Fortress warranty wasn’t enough, We now can provide extra peace of mind to you by ensuring your investment will be well taken care of. Contact United Engines for more information.