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#4664588 - 02/13/18 08:38 AM Engine startup wear understanding
mbacfp Offline


Registered: 09/02/15
Posts: 837
Loc: California
Hello all,

I know there is a lot of oil company marketing regarding engine startup wear and how to reduce it, etc. Motor oils have various anti-wear additives that are more effective at different temperature ranges.

So, tell me if I am wrong, but it seems most of the wear occurs in that middle temperature range when additive effectiveness (cold anti-wear) drops off and (hot anti-wear) kicks in as the oil reaches full temperature.

Is that the general understanding on this subject? Good day all.
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#4664596 - 02/13/18 08:43 AM Re: Engine startup wear understanding [Re: mbacfp]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
There are Anti-wear and anti-friction chemistry for Cold start, mid-range, and hot engine regimes.

Cold start wear is way overblown.

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#4664599 - 02/13/18 08:45 AM Re: Engine startup wear understanding [Re: mbacfp]
jeepman3071 Offline


Registered: 04/15/10
Posts: 4216
Loc: Storrs, Connecticut
Most of the wear from start up occurs during the moments between when the engine starts and when it builds oil pressure. The concept behind lower viscosity oils is that they flow much better in cold environments, so the engine bearings will have oil quicker.
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#4664605 - 02/13/18 08:49 AM Re: Engine startup wear understanding [Re: mbacfp]
Trav Offline


Registered: 11/20/06
Posts: 18870
Loc: MA, Mittelfranken.de
I never took an engine apart and found dry bearings, I would think the residual oil protects well enough til it get oil pressure. shrug
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#4664606 - 02/13/18 08:51 AM Re: Engine startup wear understanding [Re: jeepman3071]
kschachn Online   content


Registered: 12/26/05
Posts: 9393
Loc: Upper Midwest
Originally Posted By: jeepman3071
Most of the wear from start up occurs during the moments between when the engine starts and when it builds oil pressure. The concept behind lower viscosity oils is that they flow much better in cold environments, so the engine bearings will have oil quicker.

Not if the papers and references posted on here are true. It's what seems like would be the case but apparently is not.
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#4664612 - 02/13/18 09:00 AM Re: Engine startup wear understanding [Re: mbacfp]
mbacfp Offline


Registered: 09/02/15
Posts: 837
Loc: California
Perhaps engine startup wear could also be contributed to human driving behavior. I think we all have seen people get into their cars and tear off. Appreciate the input.
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#4664617 - 02/13/18 09:06 AM Re: Engine startup wear understanding [Re: mbacfp]
KrisZ Online   happy


Registered: 12/23/06
Posts: 7466
Loc: Toronto, Canada
It's quite amazing how many members from southern states are so concerned with cold starting and startup wear. Proof the marketing deps know what they're doing. Probably more so than the all knowing engineers that get cited here all the time.
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#4664623 - 02/13/18 09:12 AM Re: Engine startup wear understanding [Re: mbacfp]
mbacfp Offline


Registered: 09/02/15
Posts: 837
Loc: California
Very True KrisZ. Mine is more of an interest than a worry for me personally. Just curious as I appreciate people and knowledge here.
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#4664624 - 02/13/18 09:15 AM Re: Engine startup wear understanding [Re: Trav]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Originally Posted By: Trav
I never took an engine apart and found dry bearings, I would think the residual oil protects well enough til it get oil pressure. shrug


thumbsup thumbsup

Not only that, the AW and FM additives don't separate from the oil film just because the oil is cold.


Edited by MolaKule (02/13/18 09:17 AM)

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#4664625 - 02/13/18 09:15 AM Re: Engine startup wear understanding [Re: mbacfp]
Claud Offline


Registered: 02/11/14
Posts: 593
Loc: Margate England
I think bore and piston wear are the main issues in a healthy engine. The pistons and bores are cold so haven't expanded to their properly warmed up shape, also cold oil might not be getting thrown under the pistons as it would when hot.

Claud.

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#4664633 - 02/13/18 09:23 AM Re: Engine startup wear understanding [Re: mbacfp]
Char Baby Online   content


Registered: 05/25/05
Posts: 10019
Loc: ROCHESTER, NY
I used to be concerned about startup wear until I joined BITOG. Now, I don't overthink it!
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#4664638 - 02/13/18 09:28 AM Re: Engine startup wear understanding [Re: KrisZ]
Ducked Offline


Registered: 10/25/12
Posts: 4340
Loc: Taiwan
Originally Posted By: KrisZ
Probably more so than the all knowing engineers that get cited here all the time.


No engineers of any kind cited in this thread so far. In fact no citations at all.

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#4664639 - 02/13/18 09:28 AM Re: Engine startup wear understanding [Re: mbacfp]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2379
Loc: Balearic Islands , Spain
Startup wear is highest whenever the engine is cold, but i don't overthink it, i don't warm up any of my cars at all and right now all three of my cars have over 100k miles, driving normally is what warms them up the quickest.
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#4664643 - 02/13/18 09:32 AM Re: Engine startup wear understanding [Re: Char Baby]
KrisZ Online   happy


Registered: 12/23/06
Posts: 7466
Loc: Toronto, Canada
Originally Posted By: Char Baby
I used to be concerned about startup wear until I joined BITOG. Now, I don't overthink it!


Same here, unfortunately I feel some are the opposite. They read a bunch of posts about dry starts, how anything but 0wXX oils will cause extra wear, and they start worrying.

Without a bit of technical knowledge or experience it's quite easy to start believing claims that only sound valid in the most simplistic terms.
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#4664644 - 02/13/18 09:35 AM Re: Engine startup wear understanding [Re: mbacfp]
mbacfp Offline


Registered: 09/02/15
Posts: 837
Loc: California
Is Castrol's whole Magnatic stuff mostly marketing?
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