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I did list my oil as mobil 1 5w30 clean 5000 on the form I sent in. I've always seen it come back as mobil 1 5w30 on their reports. I'm not sure what the difference is or if there even is one.
The TBN is the limiting factor on running longer intervals, so it does appear that 13k is a bit too far.
Unfortunately, we won't know how long to go with conventional as I have switched to synthetic now. However, they seem to think 10k is a good number to aim for.
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