i thought the ONLY reason ester oil was "recommended" for our cars was the diamond polished heads, and that group 4 oils wont adhear to the polished heads.... causing them to get hotter and make more noise. other than that our engine runs perfectly fine with group 4 oils....
i was an advocate for redline for my first 24k miles. last two changes have been with a quality group 4 oil and everything sounds and feels fine.
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