Review on Purolator Blue Single PL14615 Filter by Matthew Mosley

While I can't scientifically rate the effectiveness of this product (because it involves cutting, draining the filler with a vise, and looking for particles), I can say that my oil has never turns black as bad luck after extended oil change intervals. The oil is medium to dark caramel in color, remains viscous to the touch and does not appear badly worn with wear. There are several videos on YouTube comparing the Purolator BOSS to other filters and the Boss looks very well put together. with plastic, silicone seals and durable housing. They also have the correct relief valve pressure for opposed 4 engines, which not all third party filter manufacturers adhere to - even in their best (fram?) filters. They can be twice the price of cheap paper filters, but still under $15 in most cases.