Does it mean that you can safely run a 20,000 mile filter for 20,000 miles without it becoming clogged and running with the bypass valve open? Or does it mean that the filtration media will survive for 20,000 miles before disintegrating, and good luck on it not becoming clogged and bypassing?
Here is an example for an Ecoboost 3.5L engine: The owner's manual specs a Motorcraft FL500S. The engine and the filter were engineered for each other, which means that the engineers thought the filter is sufficiently large and durable to handle the oil changes requested by the oil life calculator (5000 to 10,000 miles). The filter has a dust capacity of 12g, which the engineers calculated as being both necessary and adequate for this engine.
The Purolator Boss for this engine promises at least 15,000 miles duration but has only 0.5g of additional capacity per the Ascent test results published here last year. The Royal Purple filter tested promises 20,000 miles duration but has 2g less capacity. All of the filters tested by Ascent cross-reference to the FL500S, so they are comparable. That tells me that using those filters for their advertised durations runs the risk of running with a clogged filter and open bypass valve for 5000 to 15000 miles.
What do you think?
Here is an example for an Ecoboost 3.5L engine: The owner's manual specs a Motorcraft FL500S. The engine and the filter were engineered for each other, which means that the engineers thought the filter is sufficiently large and durable to handle the oil changes requested by the oil life calculator (5000 to 10,000 miles). The filter has a dust capacity of 12g, which the engineers calculated as being both necessary and adequate for this engine.
The Purolator Boss for this engine promises at least 15,000 miles duration but has only 0.5g of additional capacity per the Ascent test results published here last year. The Royal Purple filter tested promises 20,000 miles duration but has 2g less capacity. All of the filters tested by Ascent cross-reference to the FL500S, so they are comparable. That tells me that using those filters for their advertised durations runs the risk of running with a clogged filter and open bypass valve for 5000 to 15000 miles.
What do you think?