thanks Josh
I notice Sea Hawk is a 1989 boat.   My boat is a 1986 with Yanmar 2GM20F so
we are close in years.  No issues with synthetic in older engines?
Also, do you put in any oil additives routinely?

thanks,        Wade

Oh Boy
C&C 33 MK II
Lake of the Woods

On Thu, Nov 22, 2018 at 5:30 PM Josh Muckley via CnC-List <
cnc-list@cnc-list.com> wrote:

> Yes, fully synthetic.
>
> Evidently in the early 70's Amsoil started developing and marketing
> synthetic oil.  Mobile came out and tried to compete but made an inferior
> product.  Unfortunately the public already knew and used Mobile products so
> when the Mobile synthetic didn't deliver on their promises, it made a bad
> name for synthetics as a whole.  As the story goes, Amsoil came to mobile
> and proposed to show them how to make a synthetic so that the technology
> would be embraced.
>
> Amsoil has been pioneering ultra efficient oils and extended interval oil
> changes for almost 50 years.  Under the older engine technology they would
> simply have you change the filter and top up the sump, no change until
> 25,000 miles.  As the engine and filter tech improved they have now shifted
> slightly to an entirely 25k run on the same oil and filter depending on the
> application.  In addition to their extended oil change interval they also
> promote oil sample analysis.  You can detect all manner of internal wear
> and deterioration of the oil and the engine.
>
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
>
> On Thu, Nov 22, 2018, 6:11 PM Wade Glew via CnC-List <
> cnc-list@cnc-list.com wrote:
>
>> is this a synthetic oil Josh?
>>
>> Wade
>> Oh Boy C&C 33MKII
>> Lake of the Woods
>>
>> On Wed, Nov 21, 2018 at 4:16 PM Josh Muckley via CnC-List <
>> cnc-list@cnc-list.com> wrote:
>>
>>> I use Amsoil products for all my engines.  The boat gets 15w40 heavy
>>> duty/marine diesel oil.  It had a high TBN of 12.  As the acids accumulate
>>> in the oil the TBN will diminish towards 0.  I send oil samples for
>>> analysis.  Typically in high compression engines which accumulate a lot of
>>> soot/exhaust in the oil, the TBN is the limiting factor as to when the oil
>>> is exhausted.
>>>
>>> It's cool to trend oil properties over time and be able to understand
>>> the changes and what they mean about engine health.  Kinda like a blood
>>> test for your engine.
>>>
>>> Josh Muckley
>>> S/V Sea Hawk
>>> 1989 C&C 37+
>>> Solomons, MD
>>>
>>> On Wed, Nov 21, 2018, 3:31 PM Fred Hazzard via CnC-List <
>>> cnc-list@cnc-list.com wrote:
>>>
>>>> I have been using Delo 30 in my Yanmar.
>>>> What you use?
>>>>
>>>> Fred Hazzard
>>>> S/V Fury
>>>> C&C 44
>>>> Portland Or
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