Is It Normal for Fuel Consumption to Increase After Switching to Full Synthetic Oil?

[Reyn]

It is normal for fuel consumption to increase after switching to full synthetic oil. There is a break-in period between the newly replaced oil and the engine. Generally, within 7-15 days, you may experience increased engine vibration, louder noise, and higher fuel consumption. These symptoms should return to normal within 15 days. If they do not normalize after 15 days, it is necessary to check whether too much oil was added. Mineral Oil: Mineral oil is the residual oil left after gasoline and heavy oil are extracted from petroleum. In fact, mineral oil is also a type of natural oil, but it contains more impurities. Compared to semi-synthetic and full synthetic oils, it is cheaper, offers poorer lubrication for the engine, and has a shorter service life. Semi-Synthetic Oil: Semi-synthetic oil falls between mineral oil and full synthetic oil. It contains a large amount of anti-corrosion additives to improve the stability and oxidation resistance of the oil. Full Synthetic Oil: Among these three types of oil, full synthetic oil offers the best quality and durability, and it is also the most expensive. Typically, it can be used in passenger cars for 10,000 to 12,000 kilometers without deteriorating.