On Jul 7, 7:29 pm, wrote:

As far as I know this (above) is correct, but I open to being
educated ....

cheers


And as a followup, this from the Echo-USA website :

"" * EDP is defined by CARB as "Emissions Durability Period". EPA uses
the term "useful life", which is defined as "...when engine performance
deteriorates to the point where usefulness and/or reliability is
impacted to a degree sufficient to necessitate overhaul or
replacement..." (U.S. Government, Code of Federal Regulations, Vol. 40,
Chapter 1, Sec. 90.105, par. 5, §ii) ""

http://www.echo-usa.com/prod_info.asp

cheers