In a car, the Five Oils, Four Filters, and Three Fluids refer to: Five Oils include gasoline, engine oil, transmission fluid, brake fluid, and power steering fluid; Four Filters are the engine oil filter, air filter, cabin air filter, and fuel filter; Three Fluids consist of windshield washer fluid, coolant, and battery fluid. Below are details about the Five Oils: 1. Engine Oil. Some cars can directly monitor oil levels via the onboard computer. For manual checks, turn off the engine, open the engine oil cap, wipe the dipstick clean, insert it into the oil tank, and then pull it out. If the dipstick shows the oil level below the minimum (Min), promptly add engine oil of the same specification. 2. Brake Fluid. Open the engine compartment cover to find a semi-transparent brake fluid reservoir. If the fluid level is below the minimum mark, add brake fluid of the same specification. The recommended replacement interval is 1 year or 20,000 kilometers. 3. Gasoline. The dashboard will flash a warning when the fuel level is below the tank's minimum. 4. Transmission Fluid. Start the engine, engage the handbrake, wait briefly for the engine to reach operating temperature, then press the brake pedal and shift through P, R, N, and D gears before returning to P. Open the transmission fluid cap and check the level with the dipstick. Some transmissions don’t require fluid changes, so don’t be surprised if there’s no dipstick. 5. Power Steering Fluid. Start the engine and open the power steering fluid cap to check the level with the dipstick. For cars with electronic power steering, this check is unnecessary.
