COST EFFECTIVE MAINTENANCE Established in 1984, Cost Effective Maintenance (CEM) provides low cost methods to correct engine problems such as oil consumption, power loss, hard starting, smoke, poor fuel consumption, blow by and chronic overheating. Specialising in : Common Rail Diesel problems, Engine Overheating. Excessive Smoke and Oil Consumption, Power Loss , Poor Fuel Economy. Providing solutions for Petrol and Diesel engine problems, Small Vehicle or Fleet Customers . CEM helps you avoid rebuilds...whether you're a contractor on a site with zero tolerance to exhaust smoke, or need to postpone a rebuild for a few months, or simply want the most service life possible out of your equipment. There are no shortages of horror stories about Common Rail Diesel problems, and our fuel system cleaner CRD Fuel Enhancer is the key to long trouble free life.