Schedule an Appointment or Stop in. For all Your Diesel Engine Needs, Think Kerr Diesel! KOS Specializing in Diesel Engines Serving the Tri-County Area Performance and Engine Building Commercial or Personal Vehicles DIESEL SERVICE BIS 7DO 7 36 9 KERR 134 E. US Hwy 34 Mendota 815-780-7369 Performonce Tuning Schedule an Appointment or Stop in. For all Your Diesel Engine Needs, Think Kerr Diesel! KOS Specializing in Diesel Engines Serving the Tri-County Area Performance and Engine Building Commercial or Personal Vehicles DIESEL SERVICE BIS 7DO 7 36 9 KERR 134 E. US Hwy 34 Mendota 815-780-7369 Performonce Tuning