This is not correct. The B&S Pro Series 875 on the JS48 mower IS NOT made in China. It is designed, engineered, and manufactured right here in the US. Toro and MTD have been the only ones to date using the low quality Chinese engines. You can verify what I'm saying by going to the B&S link below. They do have a plant in China but that is for products sold in that region.
Why Briggs & Stratton Engines | Push Mower | Engines | Briggs & Stratton
Why Briggs & Stratton Engines | Push Mower | Engines | Briggs & Stratton
Let's take look at the JS48 you looked at. This is what I see. First, I don't know if you realize it but that is a Chinese engine built to JD spec. It has a steel deck. You really like single lever height adjusters. If something goes wrong your dealing with all four wheels. Two year warranty. I think the price is about $500.00. Now I would like you to take a look at the Toro model 20384. Yes, the same Chinese engine built to Toro spec. It has an aluminum deck. Individual height adjusters. Lower maintenance costs. Five year warranty. Promo price now is $619.00. If you are going to get the Chinese engine, would it be better to have a five year warranty even if it costs more. If you go online and do some comparisons, I think the best buy is Toro. The personal pace system is one you and your better half will really like. I must tell you I have been selling and servicing Toro for the last 25years, but even then if you really look at cost vs. Valve. Toro will come out ahead. Go out a test each of them, feel the difference in construction and ease of use, you'll get over the 4 adjusters. You better take better half with you and she'll tell you to spend a little more to get a longer lasting unit. Steel deck lasts 7-10 years. Aluminum deck 15 years +. Hope this helps and doesn't get you in trouble.