Probably nothing, that factory guy isn't going to tell everyone that they label the same filter for everyone. My .02.
The GPM flow difference between the R and standard filter is staggering. How much does a high volume R or LA oil pump flow?
That is because of the micron ratings effect on flow rates. You cant have your cake and eat it too with oil filters and race engines. Micron rating, flow rates, oil viscosity all are at play.
You can't, wait no, I should say you shouldn't, run any stock style oil filter on a race engine that sees high RPM due to the low micron rating and lower flow rates.
Just the same you shouldn't run a WIX racing filter on a street engine that see's thousands of miles either....
I run the WIX R filter on my engine. Reused the bearings when we had it apart over the winter....
I guess it works.
