I have a line on a B2150 HST 4x4. Oil is dark but does not smell burnt and has lubricity. No maintenance records. Air filter and oil filter clean and appear recent. Motor very clean. Grease points over-greased if anything. HST oil reportedly changed at 900 hrs. It has a RC60-21B midmount mower, 6 foot York rake and LA 350 loader. Bucket is 48 inches, straight and with original cutting edge. Looks like the tractor was used for mowing. Everything works as it should. He wants 8 grand. (Came down to 8 grand.) Crazy?