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

[sail-ability at sympatico.ca]

In my opinion it makes little sense to change the oil at haul out, leave that nice clean oil sit in the engine all winter and then change that new oil again at lift in. 
I change the oil at haul out so that dirty acidic oil is not sitting in the engine during winter storage time. I change the oil again at mid season depending on the engine running time. 

Cheers

JohnM
> Date: Mon, 18 Jan 2010 16:01:29 -0600
> To: C320-List at Catalina320.com
> From: patm at psiurethanes.com
> Subject: Re: [C320-list] Yanmar 3GM30F - Synthetic - why not
> 
> 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
> 
>