American and Japanese auto makers have informally agreed to postpone implementation of the new GF-4 oil standards, the biggest change of engine lubricant standards in 10 years. Driven by concerns raised by the Automotive Oil Change Assm. (AOCA), a non-profit organization representing the fast-lube industry, GF-4 standards will not take effect this fall as previously planned. Instead, AOCA will have a chance to review oil-test data from auto makers to ensure new oils will still be ...

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