Lots of things are replaced under warranty that are also not needed.
Bmw tend to function on a replace part basis. When you're not paying that's fine, but when you are paying you find specialists that fix things, or have spares dotted about.
Other than the cams the engine is no different to m3. Head gaskets can and do go. SMG is same.
It's totally a personal question, think of the warranty as just insurance as that's what it is. Do you need the insurance or do you take the risk.
I absolutely hammered my CSL and other than a noisy vanos, that was replaced, it was reliable.
I wouldn't have a warranty nowadays.
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