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Old 12-28-2010, 09:59 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 21,297
Mein Auto: 02 BMW 525i M54 auto 130K
Personally, I don't advise replacing a mechanical tensioner with the so-called hydraulic tensioner (which is merely a spring in a tube of oil) ... because of the myriad complications and increased cost and non-proven value.

Here's a recent post today of someone who mentions some of the drawbacks:
"Oh BTY BMW dosen't sell the pulley wheels for the spring loaded tensioners but they will gladly sell you an upgrade for hydralic tensioners at four times the price of a replacement wheel fro the spring type, oh and the special wheel for the hydralic type is extra" (sic)

I wonder if anyone recommends a hydraulic replacement kit over a simple replacement of the mechanical tensioners with like tensioners?
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