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Old 04-28-2003, 06:59 AM
Ken300D Ken300D is offline
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
Yes. You need to change oil just before the test. The old thin oil will slip past the rings and valves and burn easier than new oil. If you burn oil, it will burn incompletely and give you HC.

So, change oil, and if you want to be sure, add a bottle of STP oil treatment to thicken up the oil a bit more.

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