Oil filter change vs oil change

Some of the big lubricant companies advertise extended drain intervals. The one for which I worked 32 years always refers to the vehicle manufacturer recommendations. Long ago I asked a senior manager why this was so. His response was that anyone saying their motor oil could be used beyond the OEM drain interval was assuming the vehicle's warranty.

I handled the field work on many oil claims, but we never paid one. The samples were almost always contaminated with fuel, coolant, dirt, or other's products. Or, not our product at all, or nothing wrong with it, good to continue to use.

We did pay one filter claim, out of the hundreds of thousands I sold. It failed, and dumped all the oil as the car left my customer's parking lot. They just wrote a check, covering all repairs and expenses, like the rental car and taxis. The filter was a private label Purolator *I think.* Every several years we switched between them and Fram. We owned Purolator for a while in the late '80s into the '90s, and switched from Fram then, and continued to use Purolator for awhile after they were spun off. I was told the cost of the claim was built into the price of the filter, because they knew one in a million or so would fail. They could reduce those odds, but not at the price point of less than $2.00, which was a very normal wholesale price for the majority of filters sold 25-30 years ago.