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Like bussatti said, it's really the trending that's important. I've been doing this for several years on my vehicles. Labs to use are Blackstone (previously mentioned), Polaris, Staveley, and there are others. I found a lab that's in the Boston area so I will start using them. The basic analysis is around $25 and a few bucks more for the TBN test which will tell you if you can extend the interval. I've imported the data into a spreadsheet and plotted out the trends.
Regards,
paul...
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