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In addition to the hose mentioned above. I would advise anyone with a M103 to replace the heater hose that is present next to the battery tray from the firewall. When doing an inspection and cleaning out leaves, I noticed that over time, some battery acid had found its way onto the hose and made it extremely tough and almost porous looking to the eye. Replace it!
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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles
(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)
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