That's how the last WRX I owned was. My current Audi also has the oil filter located on top. Makes it nice when changing oil.Back in 2003 when the 5.7 was released, it was a pretty good location. That said, I think all oil filters should be mounted on top of the engine like this Subaru I detailed before I sold it.
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I change my oil at about 5,000 miles because that's how many miles I put on my truck per year. I'd probably go to 7-8,000 miles of I drove more.
Edit: I forgot to say what my OCI's are. I've been doing them once a year. I put 7-8k miles on each of my vehicles per year. But I might start changing it more often now after seeing how much better my truck runs with fresh oil. Could just be a placebo effect, but I'll probably change it in the spring and in the fall each year from here out.
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