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I am old school Oil is cheap insurance I change mine every 3000 I have a 03 with 50000 miles on it just rember your filter is a bypass filter and it is the weak link because the new syn. oils are so good .....when I feel lucky I will go to 5000.....Just rember its the filter stupid not the OIL....
Like many others I do my own oil changes. I change the Mobil One once a year. The first oil change was done when I bought the car in Oct. of '03. I didn't care about the dealer saying the oil was "recently" changed. I changed it anyway. This year the mileage was only 2,600 miles but it was time to change. I think I added about half a quart during the year to keep it at the "full" mark.
I seem to remember that the Mobil-1 usually had higher Fe values as the norm in other oil analyses. Looking forward to your GC analysis, as that is whay I am likely to use on my next change as well.
I'll will be hitting the 5k mark today (if the rain stops) or tomorrow so I will change the oil and drop off the sample at the lab on Tuesday morning (Monday is a holiday here, our thanksgiving) and should have results by Wednesday night or Thursday morning. My oil life shows 40% right now. Next summer I plan on running an interval where I don't change the oil until the oil life shows 0%. Then as always I will send the oil for analysis. Since the 98 OLM is more conservative than the 01-04s, I expect the oil will still be good.