Check the listing for details. BG EPR Engine Performance Restoration PN109 11 Fl. Oz. Each, 3 Pack. Condition: New, Made in United States. Listed at 38.78 USD. BG EPR Engine Performance Restoration PN109 11 Fl. Oz. Each, 3 Pack Made in USA PN 109 BG EPR® Engine Performance Restoration® is a powerhouse of an engine cleaner! It effectively softens, emulsifies and dissolves even the most stubborn fuel gums that clog piston rings. Engines are operating at higher temperatures than ever before. Combined with prolonged oil change intervals and reduced engine cooling, engine oil is under a lot of stress. Continuous thermal and oxidative breakdown contributes to oil thickening, heat retention and deposit formation. These heavy deposits can impede normal piston-ring function; thus reducing fuel economy, lowering power output, and increasing harmful exhaust emissions and oil consumption.