that was some good infor that you stated as far as it being only U.S. I however did search up the japan website for it and interestingly enoug it isn't even classified in any gf class. The 0w-40 is what they use for the gtr and it didn't have the gf rating. I did read in the owners manual a gf-5 is acceptable but gf-6 is best recommended because of the ester based oil.
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