6mm HD Valve Spring Retainer Set (24pc) by MM

for BMW M44, M50tu, S50, S52, & M54 engines 

The BMW single wound cone spring retainers are rather weak. The valve keepers will pull through the retainer at 185lbs on heads after '95.
The '95 M3 had even weaker retainer that would pull through at 165lbs. 
If the keepers pull through the retainer, the valve hits the piston and can severely damage or destroy the engine. 
The MM Crome Moly retainers are heat treated with a black oxide coating and can take 300lbs before pulling through. 
The MM DIY Valve Compression Tool makes changing out the retainers a rather simple job. 

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