Recent Topics
2005 Ford Taurus Fram Cabin Filter
by Snagglefoot - 11/15/19 12:15 PM
Is 10 microns concidered a bypass filter?
by jkhawaii - 11/15/19 12:09 PM
2018 Charger Hellcat 12,000 mile update
by mbacfp - 11/15/19 11:51 AM
Automotive Oscilloscope
by LazyDog - 11/15/19 11:42 AM
Let’s see how this looks after 4 seasons
by Bettez88 - 11/15/19 11:04 AM
Interstate batteries problems
by JimPghPA - 11/15/19 09:49 AM
2008 Dodge Ram 3500, first sample
by A_Harman - 11/15/19 09:44 AM
Steelers/Browns
by CourierDriver - 11/15/19 09:04 AM
Beard care in cold weather?
by pandus13 - 11/15/19 08:39 AM
Door Sill protection for new car - which one?
by henni - 11/15/19 08:18 AM
Exterior Home Security Cameras?
by Gebo - 11/15/19 08:13 AM
5w-20 ok for GMC 6.2l ?
by jdw1222 - 11/15/19 08:02 AM
M. Defender vs Cont. TrueContact Tour?
by lukejo - 11/15/19 07:53 AM
Alternative for Lexus Toyota WS
by Joephu - 11/15/19 06:19 AM
F1 - 2019 Brazilian Grand Prix
by gofast182 - 11/15/19 06:10 AM
2019 i30 Nline 1.6T and first service (1500km)
by rov137 - 11/14/19 10:11 PM
Garbage Disposal Replacement
by bunnspecial - 11/14/19 09:58 PM
Nest thermostat
by miden851 - 11/14/19 09:06 PM
2011 G37X
by maverickfhs - 11/14/19 08:27 PM
Recommendations for oil filter
by dawgn86 - 11/14/19 07:38 PM
Newest Members
DjS71, Akhunter, rov137, Dorisy, DesktopDave
69870 Registered Users
Who's Online Now
96 registered members (28oz, Benzadmiral, austinlunsford, 77GrandPrix, AndyB, 13 invisible), 2,070 guests, and 37 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics297,443
Posts5,115,897
Members69,870
Most Online3,589
Nov 2nd, 2019
Donate to BITOG
Print Thread
Hop To
Metallocene PAO (mPAO) verses conventional PAOs (cPAO) #5246440 10/21/19 07:28 PM
Joined: Jun 2002
Posts: 20,540
MolaKule Offline OP
Global Moderator
OP Offline
Global Moderator
Joined: Jun 2002
Posts: 20,540
Metallocene PAO (mPAO) verses conventional PAOs (cPAO)
By MolaKule

Sometimes a White Paper or technical article comes about from a question by one of our astute BITOG members and this is one of those.

Note: cPAO’s are NOT to be confused with conventional mineral oils. It is simply a way to differentiate between these two types of PAO’s.

mPAO’s are produced utilizing a metallocene catalyst. This novel catalyst allows the base oil manufacturer to control how the linear alpha olefins react.

mPAO’s consist of a range of high viscosity PAOs that have been designed to provide ultra high viscosity indicies, improved low temperature fluidity and combined with shear stability equal to or better than standard cPAOs.

(For a discussion of conventional PAO’s, See Section II: Synthetic Base Oils group IV and V at: https://www.bobistheoilguy.com/ A Review of Mineral and Synthetic Base Oils)

In chemistry, a metallocene is any of a group of organometallic compounds that consist of a metal atom bonded between two cyclopentadienyl (or similar aromatic) rings in a sandwich structure, used especially as catalysts in polymer synthesis.

Molecularly, mPAO’s have a uniform comb structure that lacks short side chains while cPAO’s have long and short side chains in a random orientation on either side of the backbone.

While cPAO’s are in no way inferior, mPAO’s offer certain advantages over cPAO’s.

Some of the advantages touted for mPAO’s are:
1. Higher viscosity indices
2. Better low temperature fluidity
3. Enhanced film thickness at higher temperatures reduce wear
4. Lower foaming tendencies
5. Lower traction properties which translate to greater energy efficiency

Most mPAO’s are available in 65 to 300 [email protected] viscosities.

In gear oil formulations, approximately 5-7% of an mPAO gives rise to higher film thicknesses at elevated temperatures and can replace conventional thickeners, such as polyisobutylene’s, which can reduce cold temperature performance.

In low viscosity motor oil formulations, approximately 0.5-3% of an intermediate viscosity mPAO gives rise to higher film thicknesses at elevated temperatures and can reduce the levels of VII’s needed to maintain viscosity and film thicknesses.

Some of the major manufacturers of mPAO’s are DuraSyn (INEOS), SpectraSyn Elite (Exxonmobil), and Synfluid (Chevron Phillips).

Last edited by MolaKule; 10/22/19 12:12 PM.

For every action there is an equal and opposite opposite criticism. shrug
Re: Metallocene PAO (mPAO) verses conventional PAOs (cPAO) [Re: MolaKule] #5246466 10/21/19 07:46 PM
Joined: Aug 2019
Posts: 375
P
paoester Offline
Offline
P
Joined: Aug 2019
Posts: 375
Joe Gibbs Driven oils are big on this stuff. They claimed to have great NASCAR oils that maintain HTHS during drafting.

Last edited by MolaKule; 10/21/19 08:11 PM.

2019 VW Tiguan S 4Motion, Pennzoil Platinum 0w-20, VW Mann oil filter
Re: Metallocene PAO (mPAO) verses conventional PAOs (cPAO) [Re: MolaKule] #5246821 10/22/19 08:11 AM
Joined: Aug 2018
Posts: 783
RDY4WAR Online Content
Online Content
Joined: Aug 2018
Posts: 783
Great write-up. I'm growing more fond of mPAO and wish more blenders would use it.

What I've wondered is where it could suitably be used in place of conventional (homopolymer, trimer, etc...) PAO. Take Mobil 1 EP 5w-30, for example, which is 30% homopolymer PAO. What if you replaced that with 10-15% of 65 cSt mPAO? Would the performance be similar, better, or worse? I imagine cost is the main reason it's not commonly used.


"He who is without oil, shall throw the first rod." - Compressions 9:1
(NA) Re: Metallocene PAO (mPAO) verses conventional PAOs (cPAO) [Re: MolaKule] #5247054 10/22/19 12:16 PM
Joined: Jun 2002
Posts: 20,540
MolaKule Offline OP
Global Moderator
OP Offline
Global Moderator
Joined: Jun 2002
Posts: 20,540
Many of the 0w8, 0W16, and 0W20 oils are using the mPAO's and other polymers to maintain film strength at these low viscosities.

Last edited by MolaKule; 10/22/19 01:03 PM.

For every action there is an equal and opposite opposite criticism. shrug
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™