"If you're thinking you want to install a PureONE oil filter on your bike, please think again. PureONE oil filters are designed for vehicles, not bikes. Because of PureONE's high efficiency, the motorcycle oil pump may not be able to handle the pressure. The Purolator motorcycle filter line is designed to meet the specific needs of a bike; therefore we highly recommend the use of a Purolator ML filter over a PureONE oil filter." - Purolator website
In regards to Purolators warning on the bypass valve and different filtering media... I guess the question to ask would be, do motorcycles produce as much oil pressure as cars do? I'm not too savvy on this topic, but I would assume since bikes rev twice as high than most automobiles, it would produce just as much if not even more oil pressure. Yes?
Also, I remember coming across a website or forum (I want to say it was a post on the Shell Rotella forum, under motorcycles) that cut open new purolator pure1, purolator motorcycle filters, mobil (for autos), honda oem, K&N, Champion, and Wal-Mart filters.
While the honda motorcycle filter got good praise, the pure1 the best and mobil 1 being 2nd best. This was based on construction, quality of components, and filter media. One thing that did jump out at me, was the Purolator Motorcycle was not the same as Pure1's filtering media and did not stand up to par with honda's OEM or Pure1s construction. Also commented on the thread was marketing ploy to get even more $$ for specific 'motorcycle' filters and the possibility of Purolator using a different maker and simply putting their label on. But again those were just comments.
As for my 919, I use Shell Rotella 15w40 in warmer weather and Synthetic 5w40 in winter. No issues what-so-ever paired with Purolator Pure 1 filter. I'm also using the longer Pure1s for even better filtering. Intervals are 2500 miles. And no oil pressure/pump filter issues either. Switched over to the combination 5000+ miles ago. Also sending in both synthetic and dino Rotellas for oil analysis to compare with Mobil 1 MX4T #s.