Interior of Bosch motor (0 130 067 017) 12 VDC used in Webasto diesel burner. Notice burned commutator and worn out brushes. This motor exhibited intermittent starts owing to poor brush contact with commutator. The motor ran for about 4400 hours (4 years) before failing. MTBF is 3-5K hours. Given the price, it should have lasted much longer.