If your vehicle is under warranty, you use what the manufacturer recommends. That's it I think. Pretty long winded marketing piece.

 

See below as a statement around group 4 vrs. 3 ... simply a fyi and not to start another debate over whats best for your engine etc. etc..

Lawrence



AMSOIL synthetic oils are formulated with a patented synthetic (synthesized or synthetically combined) base stock oil technology. These oils are made from Group IV type oils, also known as (PAO) polyalphaolefins, which produce advantages far beyond Group III oils. A few of the inherent qualities of this base stock oil include:

• Resistance to high temperature volatility (will not evaporate at moderate to high temps)
• Lower cold weather pour points (Amsoil ALM 5W-20 -53 ºC / -63 ºF)
• Higher shear strength (Amsoil up to 3,000 psi. / compared to 800 psi. with conventional oils)
• Resist oxidation (one of the primary reasons for oil destruction)

In addition to a superior base stock technology, AMSOIL includes a chemically advanced additive package specific to equipment application. The finished product exceeds industry standards and ranks highest in overall performance and protection. Making these oils since 1972, AMSOIL is recognized as the leader in the industry by continually setting higher engineering benchmarks. The company’s position is never to formulate its lubricants down to a cheaper price, but rather to engineer products to be the best in the industry.

 

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Due to the list you've mentioned, i personally believe this is why AMSOIL is the only oil company that markets it's synthetic oil as being 100% synthetic. They can do it from a legal standpoint, where as the other synthetic oil brands can't use the 100% phrase so they use the term, full synthetic.

 

Sorry for bumping such an old thread. Is this rule still working? Because I often see 100% synthetic oil and "full synthetic oil" but I always thought that it means the same.

 

More interesting reading material for those so inclined.
https://www.machinerylubrication.com/Read/31395/engine-oils-filters
https://www.stle.org/images/pdf/STLE_ORG/BOK/OM_OA/Additives/Defining%20Synthetic%20Lubricants_tlt%20article_Ja n10.pdf

 

Maybe you can say if one of these motor oils fake <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->https://themybuy.com/best-synthetic-motor-oils/ or real synthetic. I am interested in how to choose the best one.

 

Choose the one that meets JLR specifications. I don't think any of those do. Outside of that, there is negligible differences.