[C320-list] Yanmar 3GM30F - Synthetic - why not

[Pat Moriarty]

I have a question about the logic in this change system. You pull the 
boat and change the oil, now it sits all winter not run then you 
change the oil to put it back in the water? Or is it change the oil 
and run the engine then pull the boat, then run the engine after 
launch and change again?

I would think changing it at mid season would be more useful and 
leave out the change and launch part. Mine floats all year so I just 
get the 2 changes in when I have time.

Pat #130


At 03:51 PM 1/18/2010, you wrote:
>I think most manufacturers do not alter the change interval based  on the
>type of oil being used.  I have a diesel pickup, and the owner's  manual
>states that the type of oil does not affect when it should  be changed.
>
>Bert
>At Ease
>#442
>
>
>In a message dated 1/18/2010 2:50:12 P.M. Central Standard Time,
>robert.seastream at comcast.net writes:
>
>I also  considered using 'synoil' in my Yanmar, mostly because it
>should  increase the interval between changes.  However considering
>Yanmars' response included the comment "please continue to change it
>at the recommended interval for your engine as specified in the
>operator's handbook." and the higher cost of synoil, I see no  benefit
>to its' use.  I change my oil twice yearly (haulout  & launch), and put
>250 hours or less on the engine per  year.
>
>Bob Seastream
>Intuition # 906
>
>
>On Jan 18, 2010, at  10:36 AM, <sail-ability at sympatico.ca> wrote:
>
> >
> > I am a  mechanical engineer with over 40 years experience in the
> >  automotive arena. Without getting into a long diatribe on the
> >  where's and whyfore's, one can never go wrong with the manufactures
> > recommendations for service intervals and fluid use. I've seen  many
> > cases of destroyed machinery due to owners trying to  second guess;
> > it falls under the category of " if the book says  one drop, then two
> > must be twice as good"! It doesn't work that  way.
> >
> > Cheers
> >
> > JohnM
> >
> >> To:  C320-List at Catalina320.com
> >> Date: Mon, 18 Jan 2010 10:20:54  -0500
> >> From: wflowe3 at netscape.net
> >> Subject: Re:  [C320-list] Yanmar 3GM30F - Synthetic - why  not
> >>
> >>
> >> Not that this has anything to do with  our Yanmars, but I just
> >> bought a new VW with a diesel and  it comes with, and recommends
> >> using only synthetic oil. Oil  changes are recommended at 10,000
> >> mile intervals. That  said, I can't see any advantage to using
> >> synthetics if it  doesn't provide some measurable  benefit.
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>  -----Original Message-----
> >> From: Pat Ireland  <cherie320 at gmail.com>
> >> To:  C320-List at catalina320.com
> >> Sent: Sun, Jan 17, 2010 10:41  pm
> >> Subject: [C320-list] Yanmar 3GM30F - Synthetic - why  not
> >>
> >>
> >> All
> >>
> >> It's about  time to change oil and I suspect that synthetic oil
> >> should  be a
> >> better oil for diesels that standard petroleum oil. But the  manual
> >> recommends not to use synthetic oil. Does anyone know why  synthetic
> >> oil
> >> is not recommended for a yanmar  3GM30F?
> >>
> >> In looking for data, I found this quote on a  web search. It was in a
> >> thread about cold starting a Yanmar  2GM20.
> >>
> >>
>--------------------------------------------------------------------------------------------------------------------------------
> >>  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.
> >> 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. You can expect slightly increased oil
> >>  consumption
> >> and posibly a drip or two under the engine. Synthetic  oil tends to
> >> find
> >> its way past gaskets and  seals a little easier than petroleum based
> >> products. Depending on  temperature, you can also use a petroleum
> >> based
> >>  10-30 or even a 5-20 if it is cold enough. Just be sure to use a
> >> premium
> >> grade oil.
> >>
> >>  Regards,
> >> Earl Helmer
> >> Director, Service Warranty and  Engineering
> >>
> >>  ---------------------------------------------
>---------------------------------------------------------------------------
> >>
> >>  Anyone have info that would dispute this information?
> >>
> >>  Pat Ireland, Cherie, 801
> >>
> >>
> >

Pat Moriarty
PSI Urethanes Inc
PH: 800-888-5156  Fax: 512-837-8733
Please visit our web site at
www.psiurethanes.com