Lube Filter P551381/LF3478 For Donladson Brand

Product Description

Technical characteristics of oil filter:
●Backflow suppression valve: only available in high-quality oil filters. When the engine is turned off, it can prevent the oil filter from drying out; when the engine is re-ignited, it immediately generates pressure to supply oil to lubricate the engine. (Also called check valve)
●Relief valve: only available in high-quality oil filters. When the external temperature drops to a certain value or when the oil filter exceeds its normal service life, the overflow valve will open under special pressure, allowing unfiltered oil to flow directly into the engine. Nevertheless, the impurities in the oil will enter the engine together, but the damage is much smaller than the damage caused by the absence of oil in the engine. Therefore, the overflow valve is the key to protect the engine in an emergency. (Also known as bypass valve)