QUOTE(pumpman @ Jun 10 2014, 01:47 AM)
GTL is group III,
http://www.petrotechsociety.org/Presentati...0Srivastava.pdfIn BITog, pennzoil themself claim is group III
http://www.bobistheoilguy.com/pennzoil-q-a/Please google Google API 1509 appendix E
http://www.api.org/certification-programs/...itionfinal.ashx this? need to download unfortunately.
but hey if pennzoil themselves want to be conservative (going no group 3+ ) and all that's fine by me and i stand corrected

i am merely citing wikipedia that group 5 (which included GTL) as a catch all as group 3 is for petroleum base stocks.
=edit=
oh found it
http://www.api.org/certification-programs/...V-09-01-11.ashxQUOTE
c. Group III base stocks contain greater than or equal to 90 percent saturates and less than or equal to 0.03
percent sulfur and have a viscosity index greater than or equal to 120 using the test methods specified in
Table E-1.
d. Group IV base stocks are polyalphaolefins (PAO). PAOs can be interchanged without additional qualification
testing as long as the interchange PAO meets the original PAO manufacturer’s specifications in physical and
chemical properties. The following key properties need to be met in the substituted stock:
1) Kinematic viscosity at 100°C, 40°C, and -40°C
2) Viscosity index
3) NOACK volatility
4) Pour point
5) Unsaturates
e. Group V base stocks include all other base stocks not included in Group I, II, III, or IV.
pennzoil oh pennzoil lol...
supposedly their GTL base stock is so damn pure (from their claim anyways), they easily exceeded group III which is as what they claimed too (which there are no group III+ available)
so as a definition defined by the API (which wiki probably cited from), V still fits as a catch all.
from the same documentation, ctrl + f does not ping any GTL/liquid/gas keywords, or probably i am looking it wrong.
sorry not a lot of time to read through the whole documentation during office so maybe i'll go through it thoroughly at home. (28 pages

)
This post has been edited by Quazacolt: Jun 10 2014, 02:35 PM