Originally Posted by PlzRepond
I have an x241 on my 4runner right now that my local shop installed with some Castrol semi syn. Any of u guys care to guess if I can push one of these filters out to 6 or 7k?
If your 4R has a good service history and you are confident the engine is clean and running well, and your usage does not quality as "severe service," I would run these filters up to 7k miles. Like you say, this is a guess, it is really up to you. Basically if the filter is spec'd for your model, it has to last as long as the manufacturer's recommended service interval (time vs mileage) for that model. All things being equal, a clean engine that's running well will not load up the filter as much.