THE QUALITY OF AGRICULTURAL MACHINERY OIL IS DIRECTLY RELATED TO WHETHER AGRICULTURAL MACHINERY CAN OPERATE NORMALLY. IF THE QUALITY OF PETROLEUM AGRICULTURAL MACHINERY IS NOT UP TO STANDARD, IT NOT ONLY FACILITATES THE MALFUNCTION OF AGRICULTURAL MACHINERY, BUT ALSO CAUSES GREAT HARM TO THE AGRICULTURAL MACHINERY ITSELF. THEREFORE, IT IS IMPORTANT TO PAY ATTENTION TO THE SELECTION OF PETROLEUM IN AGRICULTURAL MACHINERY. HERE IS A SIMPLE FOUR STEP RECOGNITION METHOD, USUALLY "SEEING OLFACTORY TOUCH VIBRATIONS":1. LOOK: PRODUCT APPEARANCE.DIFFERENT TYPES OF PETROLEUM PRODUCTS HAVE DIFFERENT COLORS. OBSERVING THE APPEARANCE COLOR AND HEAD LUMINESCENCE OF THE PRODUCT, THE LIGHT COLOR IS MORE REFINED AND THE FRACTION AND DEPTH ARE DEEPER, AND THERE IS NO HIGH-LEVEL RESIDUAL OIL, REFINED OIL, OR HEAVY DISTILLATE OIL.2. OIL SMELL, SMELL.THE ODOR OF PETROLEUM IS GENERALLY CLASSIFIED INTO IGNORANCE, KEROSENE, GASOLINE, DIESEL, ALCOHOL, AROMATIC TASTE, ACIDITY, ETC. ADDING ADDITIVE PRODUCTS WITH A CERTAIN ACIDITY; OIL CONTAINING ALCOHOL, WITH AN ALCOHOLIC ODOR; SOLVENT OIL, AROMATIC TASTE.3. TOUCH: A SOFT AND SMOOTH FEELING OF OIL.THE REFINED OIL HAS A SMOOTH FINGERPRINT AND A STRONG FEELING, BUT THE SMOOTH FEELING OF THE FINISHED OIL IS NOT GOOD. OILS AND FATS CAN ROUGHLY INDICATE DIFFERENT TYPES AND DEGREES OF HARDNESS AND SOFTNESS, SMALL SOFTNESS, AND RELATIVELY DIFFICULT IN LARGE QUANTITIES. OBSERVE THE DEGREE OF OIL THICKNESS AND LOOSENESS AFTER WAVE 4.THE VIBRATION OF THE COLORLESS GLASS BOTTLE OF THE PRODUCT AND THE OBSERVATION OF PHENOMENA SUCH AS OIL FILM HANGING ON THE BOTTLE AND THE GENERATION AND DISAPPEARANCE OF BUBBLES CAN QUICKLY DISTINGUISH DIFFERENT GRADES OF BASIC PETROLEUM. LOW VISCOSITY OIL, FOAM, RISING FAST, DISAPPEARING TOO FAST, HANGING BOTTLE; THE SMALLER THE VISCOSITY OF OIL, THE LESS FOAM WILL BE PRODUCED, AND IT WILL RISE SLOWLY AND DISAPPEAR SLOWLY, BUT THE OIL BOTTLE WILL NOT PRODUCE FOAM.