- Reaction score
Mechanically, the cars are very durable, although the M30 can be prone to blowing head gaskets. This is largely due to the lack of cooling on the stock E9 for hot climates. The car was designed for the far more moderate European climate, hence the trouble with high ambient heat. It is possible to somewhat remedy this by upgrading the original fan and the original fan clutch. The original fan is a 5 blade design, which can be easily replaced with a 9 blade design if the fan clutch is also updated. Recoring the radiator is another option that is very helpful. Other than that, the most common failure point is the body. Again, rust is a coupe killer.