Re: [OMC-Boats] OMC Type C lab testing

From: Lee Shuster <lks@...>
Date: Sun, 30 Aug 2009 16:42:19 -0600

I'll let you do the math. OMC built electric-shift stern drives from
1962 to 1977.

Yours is most likely a 1964 - 1970. I would call tha ant "older," OMC
sterndrive in relative terms, for what that's worth?

I'm not that familar with the properties of Dextron II or III having
never owned a GM product that uses it in an automatic transmission.
I've never seen a cross-reference to Dextron as a recommended OMC Type
C subsitute. But who knows? Maybe it has similar properties?

It's easy to use google to look up the properties of GM's Dextron II
or III :

It does have a high dialetric property (35 kV), but I can't vouch for
the other parameters compared to the specs for "real" Type C or
"Premium" Blend.

If you wanna try and use it fine by me. If I was in your shoes, I'd
drain it ASAP and put the right stuff in there, regardless of cost.

Congrats! You've stumbled onto an interesting point, and again this is
NOT a dumb question.


On Aug 30, 2009, at 4:19 PM, Justin DeSantis wrote:

> I always heard that the dielectric properties are what makes type C
> different. But I'll tell you where my concern came from. Today being
> Sunday, I couldn't go to the boat shop to get OMC Type C gear lube. I
> had 3 tubes of Sierra brand type C, which I was comfortable with. But
> the local hardware store had tubes of marine gear lube that was marked
> suitable for Type C applications. I was shocked they had it, so I
> grabbed a couple tubes, just in case. It was cheap too. I think it was
> Citgo branded. Anyhow, while it says type C on the front, on the back,
> in smaller print it said something to the effect of "Not suitable for
> use in some older electric shift outdrives that require Dextron II or
> Dextron III fluid." So that gave me reason to pause. Why would it be
> Type C yet not be suitable for some electric shift models? Anyhow,
> that was the reason I asked.
> On Sun, Aug 30, 2009 at 5:04 PM, Lee Shuster<lks@...> wrote:
>> One other note I forgot to mention.
>> My Dad, who introduced me to boating holds a Chem Eng degree for
>> Ohio State.
>> He worked his entire career for Ashland Oil, the parent company of
>> Valvoline.
>> Back in the sixties, we owned an electric-shift J/E V4. My Dad was
>> also
>> curious about the "mysterious" OMC Type C lubrication requirement
>> and had a
>> sample tested by the Valvoline engineering labs.
>> They reported back (and I don't have their response) that their
>> testing
>> revealed some amazing qualities:
>> What I remember in their report was:
>> 1) very high diaelectric (non-conductive) properties (that makes
>> sense) and
>> 2) excellent anti-corrosive properties.
>> I can't recall if they ever "reverse engineered" and offered their
>> own Type
>> C product, but they were extremely impressed.
>> Just buy the right stuff and be done with it, No biggie.
>> Lee
>> _______________________________________________
>> OMC-Boats mailing list
>> OMC-Boats@...
> _______________________________________________
> OMC-Boats mailing list
> OMC-Boats@...
Received on Sunday, 30 August 2009

This archive was generated by hypermail 2.2.0 : Tuesday, 29 July 2014 EDT