Which engine oils are 100% synthetic?

[kschachn]

Everyone knows that real synthetic oil has mostly PAO as base.

Everyone knows this is one of the most trolled questions on the board.

 

[kschachn]

Same as the Mobil or better?

Mobil what?

 

[kschachn]

Blame Castrol-they sued to redefine what synthetic oil “is”, namely the inclusion of Group III bases. Not that there’s necessarily anything wrong with Group III based synthetics-but Germany has always defined synthetic as Group IV or V.

And yet at the exact same time of the Mobil/Castrol NAD dispute, Mobil was marketing hydrocracked Group III bases as synthetic in most of the world. Mobil knew they would lose any real lawsuit due to this fact. The US market was actually late to that party.

And it wasn't a Group III base really, it was a hydrocracked base. Non-hydrocracked Group I-III bases aren't synthetic regardless of the Group designation since they aren't synthesized.

 

[DCDG]

To be legally labeled as "100% Synthetic" or "Full Synthetic" in the United States, 100% of the base oil must come from a synthetic category, which includes Group III, Group IV, or Group V base stocks. Sourced from amsoil.

A finished bottle of motor oil is not just base oil. It is generally composed of two distinct parts:

• ~80% Base Oil: The fluid that provides the core lubrication.
• ~20% Additive Package: The detergents, anti-wear agents, and dispersants mixed into the oil.

For an oil to be marketed as a full or 100% synthetic, 100% of that ~80% base oil portion must be synthetic. The remaining 20% of the jug containing the additives often uses a small amount of highly refined mineral oil as a "carrier fluid" to dissolve the additives properly. Sourced from Motor oil geek.

 

[kschachn]

To be legally labeled as "100% Synthetic" or "Full Synthetic" in the United States, 100% of the base oil must come from a synthetic category, which includes Group III, Group IV, or Group V base stocks. Sourced from amsoil.

A finished bottle of motor oil is not just base oil. It is generally composed of two distinct parts:

• ~80% Base Oil: The fluid that provides the core lubrication.
• ~20% Additive Package: The detergents, anti-wear agents, and dispersants mixed into the oil.

For an oil to be marketed as a full or 100% synthetic, 100% of that ~80% base oil portion must be synthetic. The remaining 20% of the jug containing the additives often uses a small amount of highly refined mineral oil as a "carrier fluid" to dissolve the additives properly. Sourced from Motor oil geek.

More misinformation. There is no legal designation at all, nor is there anything about "100% of the base oil".

More Internet garbage.

 

[Astro14]

Everyone knows that real synthetic oil has mostly PAO as base.

Everyone knows that PAO has poor solubility for additives and needs to be treated with ANs or Esters.

Since additives typically make up about 25% of the oil, and the treat rate of the co-solvents is anywhere from 5-20%, everyone knows that your 100% synthetic PAO is actually closer to 65% PAO.

Which is why everyone knows that there is no 100% synthetic.

And we’ve talked about this before.

Thread 'Advantages of PAO over Group III: What has changed?'

Jul 18, 2022

Historically, I was conditioned to believe that PAO base oils held a material advantage over Group III or GTL in terms of oxidative stability, cold flow performance and consistency of performance (due to the varying quality of Group III base oils). As a result, it was understood that certain OEM oil standards could not be met without significant usage of PAO.

However, some well-respected members have recently said that PAO’s only hold an advantage in cold temperature performance. Furthermore, they have stated that Group III blends can have better additive response and the finished...

• The Critic
• Replies: 33
• Forum: Passenger Car Motor Oil (PCMO) - Gasoline Vehicles

• 

 

[DCDG]

More misinformation. There is no legal designation at all, nor is there anything about "100% of the base oil".

More Internet garbage.

I always knew amsoil and motor oil geek couldn't be trusted.

 

[tolian21]

Everyone knows that PAO has poor solubility for additives and needs to be treated with ANs or Esters.

Yes, I never said it must be 100% PAO base