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Oil has always been Subaru OEM 5W30 synthetic. I don't remember what group it is, but I do remember it's mixed for Subaru by a smaller company. On the last oil service, the dealer switched to Mobil 1 5w30 synthetic, which has a terrible rep for killing bearings. I think whatever killed the...

Hey guys, thanks for the advice. The first block died when it was dead stock. She was running fine on a warm day, then died on the road. Restarted with an awful knocking sound. Pretty much the entire complement of oil was gone, but none was in the bay. I always check oil at fuel stops (not...

1. What kind of vehicle you have 2013 Subaru STI 2.5liter boxer 4cyl, IHI VF48 turbo at 17.5lbs peak boost 2. What your owner's manual says -- not just viscosity, but certifications (look for acronyms like API SM, ILSAC GF-4, etc.) and change intervals as well 5w30 synthetic, API SM or SN...