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From: Karl Denninger (no email)
Date: Sun Nov 03 2002 - 15:57:16 EST
On Sun, Nov 03, 2002 at 12:16:30PM -0800, wrote:
> I've found no requirement for straight-weight oils for my 2 stroke diesels.
> I've used the same oil that truck diesels use for 14 years now so it isn't
> "absolutely inflexible".
>
> They do NOT intentionally or UNintentionally consume any more oil that a 4
> stroke diesel. Our engines do not require any oil to be added between
> regular oil changes and we are not aware of any ash specifications.
>
> We do use good quality oil for the sake of preserving the engines but the
> specifications are no different than the oil for 4 stroke diesels.
>
> Colin Foster,
>
Better go check with Detroit Colin.
I went through this earlier in the year; Delo 400 was my "oil of choice" as
it was universally ok for all the engines I had on board.
Well, they changed the formulation sometime around the turn of the year, and
withdrew the "CF-2" certification!
I looked into it, and found that Detroit has a sulfated ash specification of
a MAXIMUM of 1.0%, with a desired of 0.85% or less.
Delo 100 meets this, and Delo 400 USED to meet the former (but not the
latter.)
After talking to Detroit Diesel about this in depth, the reason for the
sulfated ash specification has to do with the exhaust valves. If you use an
oil that has too high of a sulfated ash percentage then you will find that
the valves will form excessive deposits on the seating surfaces over time
(hundreds of hours) and fail to properly seal - and subsequently burn.
I am aware of NO synthetic oil that meets either the straight-grade mandate
OR the sulfated ash requirement.
Detroit's oil requirement specification can be found in both the service and
operation manuals.
(My 2-strokes burn about a quart every 25-30 hours or so. I usually
add a half-gallon to each side between changes on 100-hour intervals.)
-- -- Karl Denninger () Internet Consultant & Kids Rights Activist http://www.denninger.net Cost-effective Consulting http://childrens-justice.org SIGN THE UPREPA PETITION TODAY ___________________________________________________________________________ || The Live-Aboard List : send a "subscribe" or "unsubscribe" request || || in body of message to: ||
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