How to know if the 4S shop has changed the engine oil?
2 Answers
Methods to determine whether the 4S shop has changed the engine oil: 1. You can directly pull out the oil dipstick, find a tissue paper, and drop the oil on the dipstick onto the tissue paper to observe the color of the oil to determine whether the oil in the engine is new or old; 2. Take out the oil dipstick and hold it at a 45-degree angle, observe the oil droplets under light. If you can clearly see that there are no wear particles in the oil droplets, it is in good condition. If there are many wear particles, it means the oil has not been changed. Engine oil is called the blood of the engine. It plays the roles of lubrication, cleaning, sealing, buffering, rust prevention, and heat dissipation in the engine. Without engine oil, the engine cannot operate normally.
I've been driving for decades, and there's always a way to solve this problem. Right after picking up the car, pop open the hood and pull out the dipstick to check the oil color: fresh oil is a pale golden yellow, while old oil is black like mud and has a burnt smell. I remember last year after a service, I still smelled old oil in the car. When I checked the dipstick and saw the color hadn't changed, the dealership finally admitted they forgot to change it. Since then, I make them sign the service sheet with the oil change time and oil brand, and I keep the invoice as proof. Engine oil doesn't last long—it's best to change it every 3,000 to 4,000 kilometers. If you don't, the engine will start humming and wear out faster, costing thousands to repair—a total waste of money. Now I've made it a habit to take a photo of the dipstick before servicing and compare it after picking up the car. If I really don't trust them, I'll stand in the workshop and watch the whole process.
