Re: [Chrysler300] Synthetic Motor Oil No-No

["John Grady jkg@xxxxxxxxxxxxxxxxx [Chrysler300]" <Chrysler300-noreply@xxxxxxxxxxxxxxx>]

There is no real basis I know of for that Mike  except opinion and rumor, mechanics are not lubrication engineers, although having more hands on mechanics become engineers would be a good thing. .. same as “synthetics are thin they will leak more”. Manufacturers of seals make no distinction in materials between synthetics or non. Both are oils , difference is in polymer chain length . Synthetics are better oils, why they cost more and are used in aircraft turbines. But nothing wrong with traditional oils . Another part of this is many “oils”from small off brand “race shops” are just relabeled oils. There are only a relatively few oil refineries in the world , owned by really big guys. So a lot of this is hawking private label stuff for $ . Ask to see the refinery ! Smile 

Sent from my iPhone

On 12 Oct 2018, at 10:26 am, Michael Reed rmreed@xxxxxxxxx [Chrysler300] <Chrysler300-noreply@xxxxxxxxxxxxxxx> wrote:

I have read (and been told by more than one mechanic) not to use synthetic oils in our classics because synthetic oil is very hard on period oil seals..

Mike

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Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>

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