How to Know if the 4S Shop Has Changed the Engine Oil?

[SanLyla]

Methods to determine if the 4S shop has changed the engine oil: 1. Locate the oil dipstick handle in the engine compartment; 2. Prepare a piece of tissue paper; 3. Pull out the oil dipstick and drip the oil onto the tissue paper; 4. Observe the color directly—if the color is brown and transparent, it indicates that the 4S shop has changed the engine oil for the car. If the color is black or even contains impurities, it likely means the oil has not been changed. Engine oil is referred to as the 'blood' of the engine, as it plays roles in lubrication, cleaning, sealing, buffering, rust prevention, and heat dissipation within the engine. During regular vehicle use, it is essential to change the engine oil periodically; otherwise, it can accelerate engine wear. If engine oil is not changed for a long time, its lubricating performance will degrade, and the oil stored in the oil pan for extended periods can oxidize and deteriorate.

[AlainaMarie]

As a veteran driver with decades of experience, here's my advice: To verify if the 4S shop actually changed your engine oil, first scrutinize the service invoice—insist they specify the brand, model, and quantity of oil used, not just slap a 'maintenance completed' sticker. Post-service, personally check the dipstick: fresh oil should be crystal-clear golden like honey, while used oil appears thick and black; newly replaced oil on the dipstick should be clean without a burnt smell. Also examine receipt details like filter replacement records or labor charges indicating oil change procedures. I always photograph the dipstick before servicing for post-maintenance comparison—no guesswork later. Don't rely solely on verbal confirmation from mechanics; request proof like used oil bottle recycling certificates or empty new oil containers. Skipping oil changes jeopardizes engine longevity—stick to 6-month or 5,000-km intervals for reliable maintenance.