[AT] unleaded gasoline

[Gene Dotson]

    Ron;
    All tractor and automotive engines built since 1972 are
designed to run on unleaded fuel. They will likely run longer
because of the lack of contaminants from the lead additive in
the fuel. The primary need for lead in the older fuels it to
bring the octane level high enough to prevent detonation in
higher compression engines. Modern fuel are formulated to meet
this octane requirement by other means. The primary concern to
using unleaded fuels in older engines was erosion and wear to
valves and valve seats. Most engines by this time that are in
regular use have had the valve seats and valves replaced by
special alloy parts, such as Stellite, that resists the heat and
wear.
    For your tractors I would just add fuel and not give it a
second thought.. John Deere has used the Stellite parts since
the mid 50's.

                    Gene





----- Original Message -----
From: "Ronald L. Cook" <rlcook at pionet.net>
To: "Antique tractor email discussion group"
<at at lists.antique-tractor.com>
Sent: Friday, December 02, 2005 11:21 AM
Subject: [AT] unleaded gasoline


: Opinions please.  2510, 3010, and 4020 John Deere gas
tractors.  Working
: tractors, not parade tractors.  Are they going to hold up on
unleaded
: gasoline or do they need some lead from time to time?
:
: Ron Cook
: Salix, IA
:
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