Spring is only for pre-start. Once running oil pressure takes over. Strong logic behind stiffer spring to reduce chain slack at start.

After 165,000 miles, the chain I replaced was about 8mm longer not enough to make the chain slack, but missing shoes on the guides will for sure do it.

If say one of the smaller guides are missing a shoe, might make the chain slack at start but the tensioner can build enough pressure once running to remove it.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)