Why does BMW shift to N gear when wading through water?
2 Answers
BMW shifts to N gear when wading through water because N gear is neutral. The main purpose of shifting to N gear after the engine stalls is to facilitate towing. The hazards of water-damaged vehicles include the following two points: Interior impact: Prolonged soaking causes deformation, roughness, and odor in materials such as carpets and seats inside the vehicle, leading to bacterial growth. Moisture accumulates heavily on the wiring harness under the carpet, resulting in short circuits due to dampness. These soaked components are best replaced to avoid post-flooding complications. Door panel impact: The door panels contain sound insulation foam, which needs replacement after water immersion. The four-wheel bearings must also be replaced because the bearing seals contain lubricating oil. If not replaced, the oil can corrode and deteriorate, failing to provide lubrication and compromising driving safety.
I've been driving a BMW for many years, and the most annoying thing is when it breaks down while wading through water. Putting it in neutral mainly prevents water from entering the engine—BMW's exhaust pipes are low, and if water backflows and causes the engine to stall, the repair costs are terrifying. Once, I forgot to take precautions while crossing deep water, and the engine sucked in water, leading to rust—costing me over 8,000 yuan as a lesson. Shifting to N gear can reduce the risk of stalling, but don't stay too long; keep the brakes steady to prevent rolling. It's best to test the water depth—don't let it exceed half the height of the tires—and cross slowly and steadily for safety. During the rainy season, I check routes in advance to avoid deep water areas—safety first, no risks. Improper wading also affects resale value, not worth the trouble. I've taught this trick to my son—simple and practical for protecting the engine.
