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A competent M96 mechanic(not me - yet !) knows that cylinder head gasket failure is unusual on an M96. "Intermix" ,yes, but that is cracking of the head, not a gasket failure. So I am skeptical about both the diagnosis and the competence of the mechanic on the M96 .
If it really does have a failed gasket, the specific test is simple -no disassembly required.
Cylinder bore problems - Mechanics 101 says do a leakdown test.Cheap and easy. While he is removing spark plugs he will clearly see signs of any cylinder head/coolant/oil leakage.
Cracked bore - borescope in some situations but this is also unlikely.
Pistons seldom fail.
But it seems the Mechanic is flailing ?
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