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.
Specially formulated for diesel engines to combat the effects of poor-quality diesel fuel
Helps prevent gelling of diesel fuel in lines, filters, and tanks
Improves starting ability in cold weather
Smooths engine operation
Improves fuel economy
Adds lubricity to fuel to reduce engine wear
Note: This ultra-low sulfur formulation can be used in engines required to meet 2007 emissions requirements (e.g., Ford's 6.4 L and 6.7 L diesel engines) and is backward compatible as well (i.e., can be used in Ford's 6.0 L, 6.9 L, and 7.3 L diesel engines).