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Value of oil sample question
I aend oil sanples oit to blackstone at each oil change for my 993 and my Cayenne. Blackstone says there is plenty of additive left in the oil on my Cayenne at 7,500 mile intervals and they suggested going to 10k miles. I know very little abou oil analysis so, aside from addotives remaining, how would I determine the safety of going for 10k oil changes?
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