My new Forester has a bit over 3k miles and it is almost time for an oil change. I got my hands on some 'Made in Japan' oem oil filters, a new Fumoto valve so I am ready to go with the exception of oil. I usually glance over some of the GC postings for entertainment/knowledge, but my knowledge of the product is not going to surpass pschlote anytime soon. I'm thinking of Havoline SM 5/30 @ 5000k intervals, Mobil 7500 @ 7500k intervals, or GC @ 7500k intervals. My first question is does my Forester benefit from this oil in the same manner an Audi, VW or other European engine that demands the GC specs. Next, I realize GC is thicker than other oils of the same weight. WHat impact will this have on fuel economy, if any? What about the lack of API starburst symbol? Could this impact denial of warranty coverage? Thats about it. If you guys can compare and contrast the 3 oils I am considering, I'd appreciate it.