Heaven forbid I should respond to an oil thread... but I will say just a couple of things:

1) That article was written in 2002. I believe M1 has changed their formula since then and is no longer "100% PAO". I could be mistaken and if so I am sure we will have 50 people saying so momentarily.

2) They seem to mention that they changed the filter somewhere along the way before 13,000.

3) The only way to really answer this question is to get your oil tested by a lab such as www.blackstone-labs.com.

4) Miles are not necessarily a good way to measure engine "running duration". Hours of operation and how many cold starts are more relavent. If you have a short commute and it takes you a year to do 13,000 then it might be too long. If you have a long commute you might get away with it. The only way to know is send in a sample at 8,000 or 10,000 (or both) and see what the lab says. I did it once out of curiousity.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra