Volkswagen ID.4 and ID.3 rear axle noise: APP310 oil level and 100,000 km service interval explained

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Less than 0.3 liters of gear oil were found in each of six Volkswagen ID.3 units belonging to a single corporate fleet. Independent workshop EV Clinic says the intended volume is around a liter. But this is not yet a mass recall — just a series of observations from one specialized shop.

Five more Volkswagen ID.4 units used as taxis in Montenegro had covered roughly 100,000 km each. The cars came in with a rattle from the rear end. After teardown, technicians reported overheated, damaged bearing separators and worn differentials, which they link to insufficient lubrication.

EV Clinic recommends preventively changing the oil in the APP310 unit every 100,000 km. Volkswagen sets no such interval, considers the fill to be lifetime-rated for the unit, and checks the drive for external leaks during service. The company has also not acknowledged a general design flaw. The workshop earlier corrected its own claim: the APP310 does have a drain plug, so an oil change is technically possible without dismantling the entire motor.

The APP310 has been fitted to the Volkswagen ID.3, ID.4, ID.5, and ID. Buzz, as well as some Skoda Enyaq, Audi Q4 e-tron, and Cupra Born models. The newer APP550 does not appear in the described cases, and on the Volkswagen ID.3 Neo the older unit will officially be replaced by the APP350. Volkswagen has previously addressed problems with the ID.3 and ID.4, admitting missteps and shifting toward customer feedback.

For now, the basis for diagnosis isn’t mileage on its own, but a hum, vibration, or rattle from the rear axle. The recommendation to change the oil at 100,000 km comes from an independent workshop, not from Volkswagen.