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I used the amsoil engine flush on a 97 850 GLT with 37K on the clock. Here is my suggestion. Buy a new good oil filter - I used a NAPA gold filter. Drop the old filter and put on the new oil filter. Then add the Amsoil Engine Flush and idle car according to instructions for 20-25min. Then pull the oil filter and drain the old oil. Put on the new Amsoil Oil Filter (SDF-42) and add the new Amsoil oil. Drive till your hearts content. At 6mths, change the oil and filter. Then you can start the extended 1year drain interval.
Yes - I drain the intercooler each time I change the oil by undoing the lower oil hose and letting it all come out.
No problems to date. Best of Luck.
Andrew
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