In the misconceptions of car maintenance, the most damaging and common one is to only change the engine oil without changing the oil filter. Many car owners, in order to save tens of yuan in costs, keep the old engine filter and replace it with new oil, unaware that this maintenance is completely ineffective and will accelerate engine aging.

The old machine filter that has been used for a long time has accumulated a large amount of metal debris, oil sludge, carbon deposits and other impurities inside. The pores of the filter element have become saturated, and the filtration capacity has greatly declined, in a semi failure state. When new and clean engine oil is added to the engine, the high-speed circulating oil will strongly wash away stubborn impurities accumulated inside the old filter element, allowing a large amount of pollutants to re mix into the new oil, directly contaminating the new oil, causing it to turn black, turbid, and deteriorate in performance in a short period of time.

At the same time, the saturated and clogged old filter element will increase the resistance of oil circulation, causing poor oil supply and decreased lubrication efficiency. The engine is prone to problems such as idle noise, reduced power, and increased fuel consumption. The regular car maintenance standards clearly require that the engine oil and oil filter must be replaced simultaneously. Whether the appearance of the old machine filter is intact or not, the loss of internal filter materials and the accumulation of impurities cannot be judged by the naked eye. Persist in replacing one engine at a time in order to thoroughly purify the lubrication system, truly achieve the effect of maintaining the engine, and avoid spending money on maintenance that may damage the vehicle.