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#4681419 - 03/01/18 10:58 AM Is it possible to build a 0w40 with no VII?
Patman Offline



Registered: 05/27/02
Posts: 20337
Loc: Oakville, Ontario
If you use a very good base oil could a 0w40 be built that uses no viscosity index improvers? I believe the original GC 0w30 (which was almost a 0w40) used little or no VII in it, thanks to it's super trick base oil.
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#4681433 - 03/01/18 11:11 AM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11964
Loc: N.H, U.S.A.
IDK

A PAO Blend of high and low visc PAO might meet pour but not mrv, so likely NO.

IIRC PP of long chain PAO are much higher than the 4sct(KV100) at typ below -80

Havent "bench blended" with PAO plus AN and POA blends smile




Edited by ARCOgraphite (03/01/18 11:19 AM)
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#4681442 - 03/01/18 11:25 AM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
dailydriver Offline


Registered: 03/14/06
Posts: 9176
Loc: Pennsylbammyvania
MPT 30K 0W-40 claims little to almost no VII added to their 0W-40 formulation.
I actually spoke to their owner about this.

Due to their TOTALLY PAO/POE base stocks used (except for the proverbial 'carrier oils' of course wink ), he said they had to add just the tiniest little bit to the 0W-40, but NONE whatsoever added to all of the other weights they offer.
This is also WHY their VIs are somewhat low compared to most else out there on the boutique market.

But, I would be VERY hesitant to use their oils in a modern GDI setup due to the very high calcium content (almost 2300 ppm!), as well as an almost race oil level of ZDDP. frown
(Curious; does Chevy/GM offer a walnut shell blasting cleaner service for the current GDI LTxes? Ford does NOT, so when that is needed, I must go to an aftermarket 'tuner' to get this done.)
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#4681532 - 03/01/18 01:49 PM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
MotoTribologist Offline


Registered: 02/03/16
Posts: 562
Loc: NJ, USA
With a PAO and oil soluble PAG blend I bet I could make a 0W-40 without VI improvers. However, I wouldn't recommend putting it into an engine.

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#4681544 - 03/01/18 02:15 PM Re: Is it possible to build a 0w40 with no VII? [Re: MotoTribologist]
Patman Offline



Registered: 05/27/02
Posts: 20337
Loc: Oakville, Ontario
Originally Posted By: MotoTribologist
With a PAO and oil soluble PAG blend I bet I could make a 0W-40 without VI improvers. However, I wouldn't recommend putting it into an engine.


Why is that?

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#4681634 - 03/01/18 04:53 PM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
OVERKILL Online   content


Registered: 04/28/08
Posts: 36430
Loc: Ontario, Canada
Originally Posted By: Patman
If you use a very good base oil could a 0w40 be built that uses no viscosity index improvers? I believe the original GC 0w30 (which was almost a 0w40) used little or no VII in it, thanks to it's super trick base oil.


The original GC was, like the original M1 0w-40, mostly PAO. This was also the case for some of the earlier formulas of the Castrol 0w-40.

The ones that are majority PAO will still have some VII in them, but it won't be a ton IMHO. You can, as ARCO noted, probably knock MRV out of the park with PAO, it's hitting the CCS target that is difficult, so you end up using a lighter base and a touch of VII to bring the visc up.
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#4681646 - 03/01/18 05:07 PM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
OVERKILL Online   content


Registered: 04/28/08
Posts: 36430
Loc: Ontario, Canada
Speaking just from a base oil perspective, which isn't really practical, but for the sake of calculation, it's easier, we could try and target the 12.9cSt of M1 0w-40 "FS" using a PAO base blend of the following:

1. SpectraSyn 8 - 8cSt @ 100C, 48cSt @ 40C, MRV of 16,200cP @ -40C, CCS of 4,800cP. 4.1% NOACK,
2. SpectraSyn 40 - 39cSt @ 100C, 396cSt @ 40C, MRV of 102,000cP @ -26C, CCS N/A, NOACK N/A

Using the Widman visc calc, to hit our 12.9cSt target we'd need 66.3% of SpectraSyn 8 and 33.6% of SpectraSyn 40. We could use an even heavier base and move that around a bit but the resulting product of the above blend would have the following characteristics:

100C Visc: 12.9cSt
40C Visc: 90.3cSt
VI: 141

And it is quite possible for it to be below the MRV limit at -40C. It would fail CCS though.


A blend using SpectraSyn 100 instead would put us at roughly 77% SpectraSyn 8, which might yield more favourable low temp performance, but I'm not an expert so I could be completely off-base there, LOL
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#4681952 - 03/02/18 04:18 AM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
SonofJoe Offline


Registered: 07/23/16
Posts: 1052
Loc: Europe
If you omitted any sort of DI pack, you could probably make a 0W40 with very little VII.

However as soon as you add the DI pack (typically 10%-ish of any engine oil), then your need for VII is going to ratchet up very quickly even with the very best of base oils.

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#4681959 - 03/02/18 04:54 AM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2378
Loc: Balearic Islands , Spain
I'd say no.
Don't even most 15W-40 Conventional oils have some VII's in them? ( Both HDEO and PCMO 15W-40s )
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#4681978 - 03/02/18 06:12 AM Re: Is it possible to build a 0w40 with no VII? [Re: FordCapriDriver]
SonofJoe Offline


Registered: 07/23/16
Posts: 1052
Loc: Europe
Originally Posted By: FordCapriDriver
I'd say no.
Don't even most 15W-40 Conventional oils have some VII's in them? ( Both HDEO and PCMO 15W-40s )


A typical European 15W40 Group I/II PCMO will contain around 7.5%-ish of liquid OCP VII. A 15W40 HDDO will contain a tad more on account of its notionally higher Ashless content.

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#4681983 - 03/02/18 06:23 AM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
SR5 Online   content


Registered: 07/07/15
Posts: 4460
Loc: Down Under
Without hijacking the thread, what about a 10W40 Group III oil ?
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#4682060 - 03/02/18 08:42 AM Re: Is it possible to build a 0w40 with no VII? [Re: Patman]
MotoTribologist Offline


Registered: 02/03/16
Posts: 562
Loc: NJ, USA
Originally Posted By: Patman
Originally Posted By: MotoTribologist
With a PAO and oil soluble PAG blend I bet I could make a 0W-40 without VI improvers. However, I wouldn't recommend putting it into an engine.


Why is that?

I'd be worried about seal compatibility, but to be honest, I rarely look as OSPs and I assume they are as picky with seals as regular PAGs are.

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