Synthetic Oils Beat Petroleum Oils On All Counts!

[act2617]

http://www.fordscorpio.co.uk/sythoil.htm

[SpoolMan]

Thats a AMSOIL oil addvert.... AMSOIL is a big brand in the states...

[johnydep]

Just because an oil is synthetic does not mean it is the best.

Check the oil rating. There are two main rating systems; ACEA, the European Automobile Manufacturers Association, & API, American Petroleum Institute

Europe uses the ACEA rating, America the API rating and Australia uses both, but APA is more common.

It is generaly said that the ACEA rating is a better system, because testing approval is very tough.
Whereas the API ratings are easier to acheive because; The API Base Oil Interchangeability Guidelines define the minimum prudent physical and engine testing necessary to ensure that engine oil performance is not adversely affected by substitution of one base oil for another.

A/B : gasoline and diesel engine oils
A1/B1 Oil intended for use in gasoline and car + light van diesel engines specifically designed to be capable of using low friction low viscosity oils with a High temperature / High shear rate viscosity of 2.6 to 3.5 mPas.s. These oils may be unsuitable for use in some engines. Consult owner manual or handbook if in doubt.
A3/B3 Stable, stay-in-grade oil intended for use in high performance gasoline and car + light van diesel engines and/or for extended drain intervals where specified by the engine manufacturer, and/or for year-round use of low viscosity oils , and/or for sever operating conditions as defined by the engine manufacturer.
A3/B4 Stable, stay-in-grade oil intended for use in high performance gasoline and direct injection diesel engines, but also suitable for applications described under B3.
A5/B5 Stable, stay-in-grade oil intended for use at extended drain intervals in high performance gasoline and car + light van diesel engines designed to be capable of using low friction low viscosity oils with a High temperature / High shear rate viscosity of 2.9 to 3.5 mPa.s. These oils may be unsuitable for use in some engines. Consult owner manual or
handbook if in doubt

API BASE OIL INTERCHANGEABILITY GUIDELINES
Not all base oils have similar physical or chemical properties or provide equivalent engine oil performance in engine testing. During engine oil manufacture, marketers and blenders have legitimate needs for flexibility in base oil usage. The API Base Oil Interchangeability Guidelines were developed to ensure that the performance of engine oil products is not adversely affected when different base oils are used interchangeably by engine oil blenders.