this is not necessarily true...if the filter media surface area is the same, than what you say is true, but if the surface area of the media is higher the life expectancy can be the same. also finer filtration can mean higher internal resistance, meaning less flow of oil even when clean...BUT I suspect that the because the oil filter was designed for the application that there will be not problems...

 

[quote=mrfikser;9470649]this is not necessarily true...if the filter media surface area is the same, than what you say is true, but if the surface area of the media is higher the life expectancy can be the samequote]

Agreed, quite right

Actually that is not correct (in theory at least and certainly within the scope of this in practice as well). The pump is a positive displacement pump which means it will deliver the same flow irrespective of resistance. What could happen is that you divert some flow across the relief valve but I doubt it as that is set for a highly contaminated filter (at which point we can assume a 5um and 10um filter are the same thing).

I practice what will happen is you will see an increase in pressure between the pumo and filter which means you are drawing more power for the pump which, in turn, means reduced brake horse. Of course these numbers are that small that it is extremely unlikely anyone would notice a damn thing.

Personally, if I was offered 5um or 10um I would take 5um rather (assuming they are both absolute ratings of course but that is a whole new debate)

 

Guys, Harley makes two filters, a 5 micron and a 10 micron. The 5 micron is designed for EVO motors and the 10 is for Twin Cams, that is the only difference between the two H-D Filters. The Twin Cam has tighter tolerances, hence the stricter filter.

 

Sorry, but you got that backwards. 5 is for the TC and 10 for the EVO

 

The 5 micron is correct.

 

That's the one you want.