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Originally Posted by Elkton86er
You are correct they changed it to 6000 for 2015. I also changed mine at 3750 and then again at 7500 - thinking I'd get the break-in stuff out early. Since the recommendation changed I decided I'm doing mine every 5000, so I did it at 11000+ and will be doing it again at 15000. Then I'll stick with 5000 intervals from then on.
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I seriously doubt that's necessary. As I said above, I had a TBN run on my oil when I sent it off to Blackstone for analysis. A TBN (total base number) test measures the amount of base additive remaining in the oil at the time of the test, and it's used to determine how well the oil is holding up. I had a TBN on a sample that had been run for 7500 miles, and Blackstone estimated that it could go 11,000.
Meanwhile, on 7500 mile intervals, my engine is not seeing any abnormal wear at 32K miles. My 30K oil analysis didn't give any indication that the filter is failing. If actual testing shows that the oil is holding up and the filter is holding up, I can't think of any reason for Subaru to change the service interval other than to make more money for the dealer service departments.
Quote:
Originally Posted by Elkton86er
I'm thinking Subaru learned something with the first 2 years production of FA20s and had a technical (e.g. warranty) reason for shortening the interval.
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Yeah, they learned that they could make more money off their customers by having them come in for more oil changes. Think about it: If there were a legitimate
technical reason to change the interval on the 2015 BRZ, why wouldn't they recommend it for the 2013 and 2014 as well? It's the same car.
If I had a 2015, I would do it every 6000 miles to maintain the warranty. But if Subaru says to change the oil every 6000 miles, doing it every 5000 miles is a waste of money unless you're really beating the shit out of your car.