Hello, the starter of my vehicle from Bosch with the part number 0 986 021 230 has been getting heavier and heavier in recent times despite the full-charged battery (feelingly, it takes twice as long as in new condition). Perhaps it is because oil may have run in from a leaky suction bridge. My idea would now be to overtake it, according to Bosch there are also spare parts, unfortunately I find neither in the Bosch catalog nor in the Internet parts for the starter. ? Or should I exchange it immediately for new ones. The price would be about 200 euros. Thank you!