Why is there oil on the rear tire of a car?
2 Answers
Oil on the car tire indicates an oil leak, and the vehicle's suspension needs to be inspected. Below is relevant information about oil on tires and the functions of tires: Reasons for oil on tires: If the suspension pressure strut has poor sealing or excessive oil, it may leak onto the tire liner due to pressure, resulting in oil on the tire. Functions of tires: Tires are circular elastic rubber products mounted on various vehicles or machinery for rolling contact with the ground. Typically installed on metal rims, they support the vehicle body, absorb external shocks, ensure contact with the road surface, and maintain the vehicle's driving performance.
Last time I noticed oil on the rear tire, I immediately checked the braking system. It was an old classic car I was driving, and it turned out to be a leaking seal on the rear brake caliper due to aging. If oil stains appear on the inner side of the wheel rim, it's likely related to brake fluid leakage, which can affect braking performance if not addressed promptly—very dangerous. I recommend using a tissue to wipe the source of the oil stain: if it's black and sticky, it might be bearing grease; if it's transparent with a slightly sweet smell, it could be brake fluid leakage. Also, inspect around the tire—shock absorber leaks can drip onto the tire, especially in older cars or those frequently driven on rough roads. It's best to check manually or take it to a repair shop for diagnosis. While you're at it, check the rear differential oil level—these steps can prevent major issues and ensure driving safety. During regular maintenance, pay extra attention to these wear-prone parts. After learning my lesson, I've developed a habit of checking them monthly.
