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.
The best all-around diesel fuel performance additive, DIESEL AID + CETANE protects critical fuel system parts while improving power. DIESEL AID + CETANE emulsifies water to prevent fuel system failure and control microbial slime, increases cetane up to 7 points, increases lubricity, improves cold flow, and cleans your fuel system.