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Re: Synthetic oil


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Posted by sotxbill on May 26, 2017 at 19:03:00 from (104.5.24.112):

In Reply to: Synthetic oil posted by bcdave on May 26, 2017 at 07:24:50:

Quoting Removed, click Modern View to see

I disagree with almost everything you said.

Hydrocracking oil strips off all of the paraffin and wax molecules, leaving a very ultra pure lubrication molecule not normally found in nature. Ones that performs with in 90% of the ester molecules and does it at a fraction of the cost. Even mobil one uses that oil in a lot of its products as it meets and exceeds the required specs for a particular oil. Yes group iv and groupV oils still perform better in extreme temperatures as in the sub arctic or in temps way above normal engine temperatures, So yes they are a specialty oil. But group III hydrocracked oils are filling the bulk of high end extended performance oils and passing all the required tests. As to synthetic,, it went to arbitration and won the legal case, as this molecule is every bit as synthetic as the ester molecules produced from natural gas.

AS to removing sludge, its not the oil, but the additives that any hd oil has that will slowly breakdown sludge. AND its the base or alkali additives that fight acids, that actually break down the sludge as a secondary effect. Good hd oils have a base/acid number of 10 to 12, making them very very alkali, and that is the magic that cleans. (guess what machine shops use to clean greasy gunked up engines with) Also anti clumping additives keep the solidified contaminates from sticking together and that keeps them microsopic and keeps them from becoming sludge.

Group IV and group V oils were a result of the cold war ('50s) effort to get vehicles to operate in alaska and other areas, so the military and darpa funded most of the research that got us there. Later on in the 60s an oil that would work in space, again, in extreme temperature swings was needed for the spacecraft. Much later on, hydro cracking (research by chevron) developed a cheaper oil almost as good as the group 4 and 5 oils, and it was within spec for most all ICE (internal combustion engine) needs.

In the 70s cars had a silicon based gasket system that replaced the cork gaskets. It was found that the additives in the better oils actually leached out the silicon and caused the gastets to leak early (research by cummins) so the gasket formula was changed by all.. So yes there is some truth to so call HD oils causing engines to leak, but again it was the additive package found in the high end oils that caused the leak, and yes, most of the very high end additive packed oils at that time were synthetic... And yes if a vehicle has lots of gunk and sludged up seals, a high end oil will slowly clean the gunk off those seals and because the seals are now exposed to oil, the engine shows new signs of leaking, so yes, there is some truth to a oil with a hd additive package can make some vehicles appear to use more oil by cleaning up the leaky parts. But again, it was the additivie package that proved to do that. And the harden seals that are brittle and cracked would have leaked if not covered by layers of gunk....

For jet engine use, synthetic oils are a must!... but ICE engines dont normally run in those temperatures. So group 3 or even a blend of group 2 and group 3 oils are the most sold synthetic oils today.

A little research on the history of oil will go a long ways to dispel all the wives tales out there.


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