I would be very impressed if someone, by ear, could estimate your idle rpm. A relatively cheap alternative if it is important to you:
CyberTech Digital Photo Laser Tachometer Non Contact Tach: Amazon.com: Industrial & Scientific
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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).
Last edited by Shortsguy1; 06-11-2013 at 12:13 PM.
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