I bought my RL411 on 10 March 1968. That makes it the 52nd anniversary of my purchase today. Still running with original engine and BW automatic transmission. I rebuilt the engine at 120,000 miles and noticed very little wear on the replaced parts. Bores had less than 5 thousands wear. Cam had scuffing so I replaced it with original, not recommended newer metric replacement, part. Metric part was not in stock with no due date. Original had 1000 parts on the shelf. Sometimes newer is not better. BW transmission still has parts available .