How to Open the Engine Oil Cap?
2 Answers
Methods to open the engine oil cap: 1. Generally, slowly unscrew the oil filler cap counterclockwise or clockwise by 90 or 180 degrees; 2. When reinstalling the oil filler cap, lubricate the cap opening with oil from the dipstick, then smoothly tighten it in the correct direction until it is properly seated. If the oil contains excessive water, there are two possible causes: 1. The oil is substandard; 2. There is a mutual leak between the cooling water system and the oil system (e.g., a dislodged bowl-shaped plug sealing the water-oil system, missing or improperly installed sealing rings/gaskets causing poor sealing and mutual leakage); 3. Poor cleanliness at the overhaul site or improper handling by the operator, leading to water entering the oil system. A large amount of water in the oil system can cause oil emulsification, resulting in oil deterioration, rusting of internal engine components, accelerated wear of high-speed moving parts, and severely impacting the engine's lifespan.
I've been driving for over a decade, and opening the oil cap is a piece of cake. First, after parking and turning off the engine, wait at least 15 minutes for it to cool down—don’t rush to avoid burns. Next, pop open the hood and locate that round or square metal cap, usually marked with an oil drop symbol, positioned near the top center of the engine. Use your hand or wear gloves for a better grip, then firmly twist the cap counterclockwise. If it’s too tight, gently wiggle it side to side before turning. Once open, don’t rush to close it—take a moment to check the oil color; if it’s dark, it’s aged and needs changing. Afterward, tighten the cap securely to prevent dust from entering and affecting the engine. Regularly performing this quick check helps avoid oil leaks and extends your car’s lifespan—simple and hassle-free.
