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I did not get a TBN... The oil is VW502.00 approved, which means it is specifically intended to be used in my engine for a 10k interval (per manufacturer specifications). I only use VW502.00 oils. I have used Mobil 1 full synth, which is the most popular but I personally did not like the oil...

Hello, I just got back my 3rd sample and this time it had something a bit alarming - a lot of copper. I typically drive the car very gently, I don't go anywhere near redline and I am careful not to stall or anything like that; that doesn't meant I'm afraid to punch it getting on the freeway...