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SilverMk2 said:
Gravity causing more piston wear is BS.
Tear apart a V configuation motor after 100K miles and measure the bore... then do the same on an Inline motor. I can promise ya, the side that had gravity pulling the piston against it will have in the neighborhood of twice the wear that the "higher" side has. Coulpe that with the natural balancing that is inherent with an Inline motor as opposed to a V motor, and you have the reason why so many inline motors regularly last between 250 and 300K miles reliably, while you rarely see a V motor go for much more than 140k...
 

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Your forgetting about one thing... the time when most engine wear takes place is at startup and shutdown... those times when the engine is not operating at normal conditions. And yes, we are talking about years of wear here. Something that will only be measureable over the space of 8 to 10 years to even be measureable.
 
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