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From: Ron Rogers (no email)
Date: Wed Nov 06 2002 - 05:08:57 EST
Since I would have to get warranty support from Mack Boring, I'll stick to
their guidance. I'll start using synthetic after 250 hours. I don't think
that your answer came from Japan. Earl Heimer doesn't sound Japanese to me.
I suspect Mr. Heimer works for Yanmar USA.
The dichotomy between Mr. Heimer and Mack Boring is interesting. This
confusion is added to by an atrocious engine manual written by a Japanese
who learned British English and then tortured it almost beyond recognition.
----- Original Message -----
From: "Jan Guthrie" <>
> After receiving numerous different answers from Yanmars USA tech support
> (mostly IMHO run by local distributors who are selling *Yanmar*
non-synthetic
> oil), I decided to write directly to Yanmar in Japan about the use of
synthetic
> oil ...... the following is the answer I received.
>
> ----------- original message --------------
> Mr. Guthrie,
> Your Yanmar pleasure boat engine should be broken in before using the
> sythetic oil. As long as you have at least 50 hours on the engine and it
> has be used at all RPMs, then synthetic oil is OK to use. Please continue
> to change it at the recommended interval for your engine as specified in
> the operator's handbook. <SNIP>
Regards,
Earl Helmer
Director, Service Warranty and Engineering
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