Posted by jdemaris on April 06, 2014 at 05:01:39 from (70.194.4.230):
In Reply to: Confused on oil posted by David G on April 05, 2014 at 19:08:42:
First -define what you are calling "synthetic." Many oils sold as "full synthetic" in the USA have NO synthetic content at all. Many are based on pure petro from the ground. Some posters claim that "synthetic" oil has higher heat tolerance. Again -NOT true for many. In fact, many pure petro oils from Shell have a higher "flash point" that most of the consumer oils sold as "full synthetic." Probably one of the best oils around are those with high anti-wear additives like ZDDP. Briggs & Stratton sells small engine oil with more protection that just about any oil sold for automotive use. Back to my point - even when oil IS truly synthetic - it has absolutely nothing to do with "better" lubrication. True sythetic oil has a high heat tolerance well over 400 degrees F and a wider viscosity range relative to air temps. Standard petro-based oils tend to have "flash points" from 380 to 430F. True synthetics (often sold as racing oils) can be near 500 degrees F. That's why our military used them on jet engines.
Again - lubrication is about the proper viscosity, temp range, and additive package. Not about being from petrol, coal oil, or any blend made in a test tube.
By the original definition - synthetic oil is/was oil made from a non-petroleum base. MANY oils sold in the USA as "synthetic" are made from a 100% petroleum base. Pure marketing BS as I see it.
Adolph Hitler used true synthetic successfully during WWII due to lack of access to petroleum. It was found that the new synthetic oil had far better heat resistance then petro oil (Flash Point). The US military copied the product and used it in jet engines (where heat was a problem). Years later - a military guy marketed the stuff to civilians as "Ammsoil." He was jet pilot and commander Colonel Albert J. Amatuzio.
Now? There are many oils sold as "full synthetic" that give less high heat protection then many conventional petro oils. I don't see the point?
Next time someone tells you how much they love their so-called "synthetic oil" - ask specific questions.
Note that true synthetic oil is still available and mostly used in off-road and racing. It still has that very high flash point and stable viscosity. Shell Rotella T conventional oil has a higher Flash Point then many oils sold as "full synthetic." Here are a few Flash Point ratings of various oils. Highest to lowest.
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