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- TrackrigExplorer IICat C7 - once a year as I only put on about 7,000 miles a year. Get the generator done at the same time.
Have you ever had the anti-freeze flushed and changed on both of them?
Bill - wolfe10ExplorerRecommendations vary by engine family and even by year of engine and oil capacity.
What engine do you have?
The vast majority are every year-- miles varies quite a bit. - antsinmypantsExplorer11,000 miles or ever other year which ever comes first
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