NEWS FLASH!!! To all owners of Freightliner and Western Star Class 8 trucks with Detroit Diesel engines!!! Effective January 4th, 2016: The number of teeth on the GHG17 Detroit Diesel 13/15/16 engines has changed. FL0189 can no longer be used with these new engines. The NEW Diamond Gard Part number for these GHG17 engines is FLA579.