Posted by knothead1 on March 28, 2010 at 15:32:00 from (74.234.147.244):
In Reply to: Re: 666,686 ????? posted by Erik Dekeyser on March 22, 2010 at 17:16:48:
All engines are not the same. The 666 used the American built D-312. The early 686 s also used the D-312 but all later 686's used the German built D-310. The 312 is a better engine. Other than that the 666 and 686 are the very same tractor with the same HPO.
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