Yes, the additives are the life and performance of the oil. The base oil goes along for the ride and lasts a longer time.I've heard many times that the limitation of modern synthetic oil is the filter needs changed before the oil, and that the additives run out before the the oil breaks down.
Oil is cheaper than piston rings and valve seals though. As a mechanic I do two things, "preventative maintenance", and repairs...🤷
Some filters do have mileage ratings for them plus technical data as well. With a Mopar filter, and some inexpensive filters, no information is available.
The mileage ratings are conservative, I think, and based on worse conditions. The FRAM TG11665 that I am using is rated at 15,000 miles, their next step up one is rated at 20,000 miles. So two 10,000 km oil changes should be fine with either filter.
The 3 FRAM filters are 10,000, 15,000 and 20,000 miles
A FRAM Rep was a member here years back. He and shipo debated this oil filter longevity topic with gusto IIRC.
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Too bad all oil filters don't have this degree of detail.
What determines the life of the filter? Dirt holding capacity should be the big factor, one would think.