A Core deposit is a form of deposit you pay until returning your old part. If you don't have the core at the time of purchase, you must pay the core charge. That charge is refunded to you when you return the core.
MAG 1 All Fleet 30W Diesel Engine Oil's high detergency and superior dispersancy keep engines clean and soot suspended in the oil despite longer drain intervals and increased soot loading. It provides exceptional resistance to thermal degradation, even under the most severe operating temperatures, prevents viscosity increase and the deposit formation and wear that can result. Superior anti-wear agents extend engine life despite high operating temperatures and extended service intervals and higher starting TBN provides added protection against acid build-up that can cause rust and corrosion. If provides highly reliable performance over a wide range of temperatures, including severe cold.