WP8 series engines for tractor trucks WP9H series engines for tractor trucks WP10H series engines for towing vehicles WP10 series engines for towing vehicles WP10.5H series engines for towing vehicles WP12 series engines for towing vehicles WP12NG series engines for towing vehicles WP11H series engines for towing vehicles WP13NG series engines for towing vehicles WP13 series engines for towing vehicles WP9H series engines for medium- and heavy-duty trucks WP10 series engines for medium- and heavy-duty trucks WP7 series engines for medium- and heavy-duty trucks WP4.6N series engines for medium- and heavy-duty trucks WP4.6N series engines for medium- and heavy-duty dump trucks WP7 series engines for medium- and heavy-duty dump trucks