Synthetics have ONE advantage. That advantage isthey resist extremes
of temperature - maintaining their viscosity much better than regular
oils. That is IT.
This means they are an advantage on engines that experience extremes
of temperature - either in environment or operation.
So cold starting in Athabasca or Winipeg or Nome, or hot operation in
death valley, or Pheonix, or any other hot place, or any engine worked
hard with high operating temperatures - particularly if built to fine
tollerances, all will benefit from using synthetic oils.
They have another advantage. Chemists are more able to choose which
compounds are in the oil. This gives the oil better characteristics.
In addition, because synthetic oil is more expensive, oil makers are
able to afford to put additives in the oil.
The better charachteristics are almost totally related to maintaining
There are LESS additives in the average synthetic oil because it needs
less. It needs less additives BECAUSE it is a more expensive oil.
Now that is a generalization, because there are different kinds of
"synthetic" oils. However, there need be NO viscosity index improvers
or pour point depressants added to a good synthetic. Therefore the oil
is closer to "all oil" than a regular oil with longchain hydrocarbon
and polymer viscosity index improvers added.
Depends where you are and how long it takes to put on 6000 miles.
Personally I wouldn't push it much past 6000 or 6 months, and use a
quality Wix , Putolator, or equivalent filter (Napa Gold, Motorcraft,
or Mopar are all pretty good)
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