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 >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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