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#4684455 - 03/04/18 06:48 PM Change in brand brings increase in consumption?Why
fdcg27 Online   content


Registered: 09/25/09
Posts: 15728
Loc: OH
We've had many posts in which members have claimed a sometimes drastic increase in oil consumption when changing brands. PP appears especially prominent in these claims.
I don't think I've ever seen this myself, but there are too many members claiming to have seen this for it to be dismissed as myth or mere anecdote.
I wonder why a change in brand of oil might cause any change in oil consumption?
What technical explanation might there be for this?
Higher volatility?
This would bring only a small increase.
Switching from an oil at the thicker end of the grade to one at the thinner end?
Again, not that much of a difference.
What might cause a very noticeable increase in oil consumption when doing no more than changing brands within the same grade?
Is this real? I think it is based upon the number of longtime members who say they've seen it.
The question is how we can explain this in rational terms.
_________________________
17 Forester 12K MSS 0W-20
12 Accord LX 86K PP 5W-20
09 Forester 95K M1HM 10W-30
01 Focus ZX3 118K PP 5W-20
96 Accord LX 104K T5 10W-30
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#4684463 - 03/04/18 06:56 PM Re: Change in brand brings increase in consumption?Why [Re: fdcg27]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1141
Loc: Winchester, Indiana
I think Mola or some of the other guys have chimed in on this before. Large changes in oil composition and additives can cause some "consumption" as the additives neutralize each other and interact. It's that chemistry stuff, above my head. I saw this when I switched my Forester from RT6 to Mobil1 0W40.

Therefore, I choose to stick all to Pennzoil synthetics. I've exclusively used PUP in my Fusion for the past 100k, and it still does not use any oil whatsoever, even over the last 17.2k OCI. It did thicken up just a hair, but with no top-off that's likely to be expected a little. I may drop back to 15k and not even bother checking UOAs anymore.

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#4684469 - 03/04/18 06:57 PM Re: Change in brand brings increase in consumption?Why [Re: fdcg27]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17795
Loc: PNW
I haven't seen any drastic changes in oil consumption on my cars or trucks, but don't switch oils much. My Hayabusa would use way more Mobil 1 full synthetic motorcycle oil than Valvoline or any other conventional motorcycle oil - same weight used, 10W-40. I'd think high volatility certainly does play a role. One reason I look for oils that have a low NOACK.

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#4684479 - 03/04/18 07:05 PM Re: Change in brand brings increase in consumption?Why [Re: fdcg27]
Eddie Offline


Registered: 12/07/03
Posts: 9578
Loc: Florida, Cape Coral
I believe that increased oil consumption when changing brands is caused by a new mini-break-in. This can be caused by small difference in viscosity and different levels of different additives. I believe this because the oil consumption usually goes back to it original value after an oil change or two with the new oil. One reason I don't switch brands unless there is a good compelling reason. Ed
_________________________
CX5 Touring 2.5L :-)

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#4684550 - 03/04/18 08:17 PM Re: Change in brand brings increase in consumption?Why [Re: fdcg27]
SilverFusion2010 Online   content


Registered: 06/29/11
Posts: 1663
Loc: Crawfordville FL
Id be interested in the chemistry stuff going on if one of our formulators could chime in
_________________________
2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30

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#4684576 - 03/04/18 08:40 PM Re: Change in brand brings increase in consumption?Why [Re: Eddie]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Originally Posted By: Eddie
I believe that increased oil consumption when changing brands is caused by a new mini-break-in.


It's caused by the existing "Tribo-Chemical Barrier" being UTTERLY DESTROYED
by the new formulation, and as the new TCB is formed in its place instead!

grin crackmeup LOL grin2
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4684605 - 03/04/18 09:04 PM Re: Change in brand brings increase in consumption?Why [Re: Eddie]
philipp10 Offline


Registered: 05/09/14
Posts: 1184
Loc: Minnesota
Originally Posted By: Eddie
I believe that increased oil consumption when changing brands is caused by a new mini-break-in. This can be caused by small difference in viscosity and different levels of different additives. I believe this because the oil consumption usually goes back to it original value after an oil change or two with the new oil. One reason I don't switch brands unless there is a good compelling reason. Ed


And what would be this magical oil usage mechanism?

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#4684607 - 03/04/18 09:05 PM Re: Change in brand brings increase in consumption?Why [Re: Linctex]
Ducked Offline


Registered: 10/25/12
Posts: 4388
Loc: Taiwan
Originally Posted By: Linctex
Originally Posted By: Eddie
I believe that increased oil consumption when changing brands is caused by a new mini-break-in.


It's caused by the existing "Tribo-Chemical Barrier" being UTTERLY DESTROYED
by the new formulation, and as the new TCB is formed in its place instead!

grin crackmeup LOL grin2


But seriously though, this would make some sense for increased wear. It makes no apparent sense for increased consumption.

(Unless the tribolayer seals leaks, which I don't think it will, much.)

Apart from volatility and viscosity difference, to explain that you'd have to go for something like a negative interaction between the VII's reducing the effective viscosity.

I dunno if there's any experimental evidence for that and if there is I bet it'll be hard to find.

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#4684612 - 03/04/18 09:06 PM Re: Change in brand brings increase in consumption?Why [Re: fdcg27]
Larkin Offline


Registered: 12/14/14
Posts: 36
Loc: MO USA
I've changed brand of oil in all my cars. Never had a issue!! The cars that use oil i had to add oil. The car that never had to add oil not a drop. Every 10k or 5k My feeling each oil has something to offer in the way of cleaning. Just my input

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#4684660 - 03/04/18 09:52 PM Re: Change in brand brings increase in consumption?Why [Re: fdcg27]
Marco620 Offline


Registered: 02/25/14
Posts: 2195
Loc: Deplorable Kansan,HK fan!
I consumed a bit when going from 0w20 Castrol Magnatec to using the "Make The Switch" promo of PUP 0w20 of 1/4 qt over 5k miles and then none after that. Did 9-10k OCI with PUP 0w20 no issue.
_________________________
2015 Civic 162k mi.0w20 Redline/Archoil,HPS SRI,Yokohama/Moog links Borla Exhaust/Vibrant Resonator/Tein Suspension
Go Nashville Predators!

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#4684703 - 03/04/18 10:47 PM Re: Change in brand brings increase in consumption?Why [Re: fdcg27]
Konstantine Offline


Registered: 01/12/18
Posts: 44
Loc: Rockies
I would guess that the HTHS viscosity of the oil in service and the type of engine would be the biggest variables.

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