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Old 05-11-2003, 11:15 AM
Ken300D Ken300D is offline
Registered Diesel Burner
Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
I'm pretty sure the humming is caused by air bubbles when the fluid level gets low. I have to top off my reservoir about once every two months, and it only takes maybe four ounces of fluid to do that.

1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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