opinions on synthetic oil

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Who said they are scraped?
The problem is when one buys a used car they can never know for sure how it was used or abused or if it was given the proper preventive maintenance or
not.

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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.
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snipped-for-privacy@snyder.on.ca wrote:

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.

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The better charachteristics are almost totally related to maintaining viscosity.

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.

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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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