100% Paraffinic Base Oil

[sprintman]

Does that mean Group I?

 

[Jelly]

quote:

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Originally posted by sprintman: Does that mean Group I?

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No.

 

[sprintman]

II, II+ or III even?

 

[Shannow]

Sprintman, it just means straight chain hydrocarbons. No double or triple bonds, no aromatics. Supposed to be pretty stable, thus their popularity on advertising quite a few years ago.

 

[MolaKule]

Paraffinic base oils comprise Groups I-III and are often used because they are more thermally and oxidatively stable than their cousins the napthenics.

 

[pscholte]

quote:

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Originally posted by MolaKule: Paraffinic base oils comprise Groups I-III and are often used because they are more thermally and oxidatively stable than their cousins the napthenics.

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'Kule, I thought their cousins were the O'Malley's.

 

[Ray H]

quote:

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Originally posted by sprintman: Does that mean Group I?

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As previous stated by MolaKule, paraffinics are present in Groups I - III. Group IIIs contain the highest percentage of iso-paraffins (very desirable) courtesy of severe hydro-processing having catalytically processed the lion's share of residual, undesirable, normal paraffinics, waxes, naphthenics, and aromatics to iso-paraffinics. (This gets to the heart of why Castrol prevailed in its squabble with Exxon/Mobil over the use of the term, "synthetic".) Of the three listed groupings, Group I has the highest percentage of undesirable molecules. When you see catch phrases such as Pennzy's "Pure Base" or ChevronTexaaco's "ISOSYN", I imagine the odds are pretty good that the marketing department's babble indicates use of Group II and/or Group II+ base stocks. (A "semi-synthetic"? No, let's not go there...) [ October 25, 2003, 03:29 PM: Message edited by: Ray H ]