If there is one thing that is really unique about this car compared to any other C63 we have heard is the exhaust system.
This car rumbles the entire workshop when it starts and that was inevitably one of the deciding factors that enticed this customer into buying this vehicle.
Having an exhaust on this vehicle was also a giveaway that something may have been done to the vehicle prior to the owner purchasing it.
Enter the world of E85. Corroded lines, heavy amounts of rust sitting in a fuel tank, corroded fuel rails, rusted fuel pumps, partially blocked injectors, o2 sensors failing from higher cylinder temps due to partially blocked injectors only leads to one thing. E85 fuel had been run in this car for an unknown period of time.
The one tell tale sign was the engine every now and then would blow smoke but this was ever so intermittent. This was a sign of an impoending engine failure. It was just a question of time.
Obviously the previous owner who owned this car ran it on E85 unbeknowst to him that these vehciles are not designed to run on corn syrup and was obviously unaware of the fact that this would over time lead to loing term damage.
Obviously it would have been noticed from the intermittent plumes of smoke that some level of engine damage was caused and therefore disposed of the vehicle before any major engine failure. Lucky for our customer, this vehicle was under long term warranty.
The previous owner obvious;y had the car tuned by a poor quality tuner who pushed this engine to its limits which realistically speaking, no engine is ever tuned from the factory to run on the limit of its tune.
Safety parameters are always put in place to protect all moving parts within engines or gearboxes. May owners of these cars fail to realise that these vehicles are already performance tuned form the factory.
After all, it is why they cost the money they cost. Purely for that reason of reliable performance
This engine either died from detonation or the slow degradation of a dying fuel system which was starting to block fuel injectors which can also lead to detonation over time which if unattended. This then eventually leads to engine failure.
The beautiful thing about the C63 is that it is a mighty tough engine and can take a walloping in punishment but can it take E85 and run on an otherwise different tune and stay reliable ? No it can’t.
The one noticeable feature of this engine is that it performed till the day it just started missing from broken ring failure.
There was no slow decrease in power over time. This motor just suddenly stopped performing through a very noticeable misfire and upon carrying leakage tests and compression tests, we discovered one cylinder down completely and another on the way out
So, have you been thinking about running your car on E85? Well if you have or currently are running on E85, expect the same over time to happen to your own vehicle If the vehicle is not designed for E85. it is our best advice not to alter the tune of your engine.
The engines in German performance saloons are designed to perform with total balance to the vehicles capability and to do this reliably every day. The min ute you change the tune of your engine, you upset this balance.
There is nothing we can not undertake and there is nothing we can not obvercome. Even bad fuel system damage like this and replavceing broken engines.
This engine however died an early death because the previous owner was unaware and killed an otherwise perfectly balanced performance car. Our best advice ? Run the fuel in your car that it is meant to run on and you will not encounter these problems.
We hope you enjoyed this post and of you have any question don’t hesiate to call us