Originally Posted By: Ed_T
Originally Posted By: Gary Allan
As far as extended drains ..without a dedicated filter designed with added holding capacity, the service will dictate the filter's ability to work. The longer the mileage over a span of time the lower the insoluble production due to fuel enrichment as measured per mile. It basically comes down to hollow(er) miles in between warm up events.
So in layman's terms, what does that last sentence mean?
A filter has a given holding capacity in grams. Your engine produces insolubles at a much higher rate during fuel enrichment.
You and a neighbor. Same car. Both daily drivers. He goes 10miles one way to work. You go 20. He's out of fuel enrichment @ 5 miles ..so are you. You, however, have 15 miles at a radically lower rate of insoluble production ..while he only has 5. He will load his filter (basically =2 loading events per day) at the same rate that you do. What he won't have is 20 more mostly hollow miles on the filter per day
That's why saying/asking "will xxx filter last 15k" is an improperly loaded question. It will last 15k if there are enough hollow miles involved. This usually equates to a mileage over a given time span ..which is the basis for your miles/time non-OLM recommendations. IF the properties of the engine are such that the insoluble production is so low out of fuel enrichment, the OEM may say "every other" oci for a filter change IF mileage dictates the oil change interval. Like 7500/6months. There YOU DO get an OEM spec'd filter to last 15k since 15k is filled with MANY invisible miles.