I put about 1500 miles a year on my 2013 STL with the 998 engine. Total miles is about 17,000. The last two years I put in fresh full syn oil yearly, but did not change the two filters. I'm thinking of changing the oil again this year and also not changing the filters, as it is easier and cheaper. The oil always looks good and I don't have to add any oil between changes, which seems to be unusual (but great) for the 998 engine. Am I being too cheap?
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