I'm impressed that Chevron responded at all.
George Richardson
'57 TR3, TS15559L
(getting ready to paint - and now on the web!)
http://www.merlingroupinc.com/tr3.htm
-----Original Message-----
From: Andy <adixon@loudoun.com>
To: triumphs@autox.team.net <triumphs@autox.team.net>
Date: Friday, December 12, 1997 1:48 PM
Subject: Unleaded gas; Chevron's view
>In response to a recent thread, I wrote to the customer service departments
>of several gasoline companies. So far only Chevron (No financial interest,
>Yadda Yadda Yadda) has responded. I guess unleaded is OK under the
>"right" conditions. I'm pessimistic so I guess I'll go for the hardened
seats
>just to be sure.
>
>Here's their response:-
>
>"I am not aware of any inherent chemical properties of current unleaded
>gasoline that would prevent valve seat sink under the "right" service
>conditions in cars with valve seats that are not hardened. Nor do I
>believe that many unleaded gasolines contain an additive to compensate
>for the lack of lead. Chevron's unleaded gasolines don't. However, it
>is Chevron's belief that using unleaded gasoline in older cars with
>valve seats that are not hardened does not present a problem for most
>types of service. This is should be particularly true for the light
>service most antique sports cars see. Valve seat sink only becomes a
>risk at higher than normal engine temperatures generated by operation at
>sustained high speeds and/or loads. Please see our technical bulletin
>on the subject at www.chevron.com/chevron_root/prodserv/index.html.
>
>Happy driving."
>
>Do with it as you will
>
>Andy
>
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