I had my done. By a Hino only shop. Be careful. You will find a lot of post on here with mechanics TRYING to work on Hinos that had no success. To be honest I DH to Greasy shop about 2 times a year. I've DH 600 miles just to get to VA. It will cost you an easy 2-3K depending on what else you do. I did. Injector cups and O rings, fuel return line, rocker box gasket, valve cover gasket, oil cooler o rings and adjusted the valves. There are some crazy screws and other screws/gaskets that have to be replaced they shouldn't be reused. My Hino is a 2007 338 w/820K miles. Yours is newer so I'm sure it's a little different.