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Really? Brittle rings and cold oil??? #5260343 11/06/19 10:12 PM
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ls973800 Offline OP
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There is a forum member over on the Pilot forum who just responded to an owner who lost his engine with 118000 miles on it. This member has posted this statement which I find to be, well for lack of a better word, hogwash!

"This seems like oil starvation. It will take a full tear-down to identify the source of the metal fragments, but I would bet on rings. Quick changers don’t give the super hot engine internals a chance to cool down to ambient (room) temperature before refilling with cold oil. That causes thermal shock, which some brittle metals (rings) don’t cope well with.
...
That’s why I do my own oil changes, and always let the engine cool off at least one hour while letting every last drop of old oil drip 💧 out into the pan, then pre-fill the new filter also to prevent oil starvation on the first start."

First, engine internals are not going to cool down to ambient temperature within one hour. Adding oil is not going to cause thermal shock on "brittle rings", correct.

Here is a link if you want to read what happened to the owners engine and some of the discussion so far.



Last edited by MolaKule; 11/07/19 10:30 AM.
Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260346 11/06/19 10:19 PM
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Chris142 Offline
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LOL,


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260348 11/06/19 10:27 PM
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GZRider Offline
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Yeah you're correct it's a load of it, starting a modern power dense engine below 20 degrees would produce more of a delta in temperature over a shorter period then using room temperature oil in an engine that's been run under normal conditions and not given time to cool down. Now with that said if you took an S2000 or 370z and wailed it around a track for an hour or two I could see the wisdom in letting everything cool down for several hours before changing the oil, but that's from a plastic oil pans and filter housings and valve covers and or their gaskets perspective.

Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260357 11/06/19 10:46 PM
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tom slick Offline
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I’m curious how pouring cold oil into the engine gets in hot rings. It must jump up from the sump!


You get what you pay for...
So keep in mind how much you paid for this advice.
Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260393 11/07/19 12:29 AM
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cjolson140 Online Content
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Oil has a fairly low specific heat, so I doubt you could thermally shock an engine bad enough to cause damage that way. “Shock” cooling is (was?) a pretty common test done by car manufacturers anyway, by suddenly & severely dropping the coolant temp on a loaded engine in a test cell.

Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260414 11/07/19 03:53 AM
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demarpaint Offline
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Sounds like neglect, or a bad engine. Even Honda turns out an engine or two that fail. wink


God Bless Our Troops

Re: Really? Brittle rings and cold oil??? [Re: cjolson140] #5260426 11/07/19 05:08 AM
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ZeeOSix Offline
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Originally Posted by cjolson140
Oil has a fairly low specific heat, so I doubt you could thermally shock an engine bad enough to cause damage that way.


To add, the oil that comes into contact with the rings is a very small volume (a thin film), so it has hardly any thermal mass to cause parts to be "thermally shocked".

Whoever came up with this wild "shock" theory doesn't understand heat transfer.

Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260429 11/07/19 05:15 AM
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PimTac Offline
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Sounds like a lot of wild speculation. Had the engine even been opened up yet?


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260431 11/07/19 05:32 AM
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dnewton3 Offline
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Agreed; that is complete and total hogwash.

If that were true, every single oil-change quick-lube and dealership would have to let vehicles cool down for at least an hour, or risk huge volumes of lawsuits from the unavoidable doom of shattered pistons and such. And every single owner's manual is at the cusp of legal malfeasance because not one I've ever read states to let and engine cool down or risk engine death.

Yeah - right ... smirk2


The act of preventative maintenance, in and of itself, is FAR MORE important than brand/grade/base choices among lubes and filters.
- under maintaining something is akin to abuse/neglect; that can kill equipment by shortening the lifespan
- over maintaining something has never been proven to be anything but a waste of time and money
Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260446 11/07/19 05:59 AM
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JLTD Online Shocked
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crackmeup Those guys over there don't know [censored]. thumbsup For throwing in the BITOG reference.


I use the overseas manual to choose my viscosity.

Using AMSOIL

Hers: 2008 Jeep Liberty 154k, SS 5w30/Amsoil

His: 2015 4Runner 60k, SS 5w20/Amsoil

Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260463 11/07/19 06:25 AM
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Mackelroy Offline
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Ive always found a hot or warm engine, reheats new oil as its put in. Its actually much better than putting cold oil in a cold engine on start up

Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260499 11/07/19 07:29 AM
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Bud Offline
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Anything you read on an internet forum of any kind, you need to take with a grain of salt.


2016 Honda Pilot EX-L with NAVI.....Mobil 1 0w20 AFE and Honda OEM Filter
Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260512 11/07/19 07:45 AM
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4WD Offline
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To change the oil … I start the engine and then pull up on the ramps … change when warm, not hot.
And to think all these years I thought it was because I did not like pain …
What a feeling to know it was for a greater cause ! 😜

Re: Really? Brittle rings and cold oil??? [Re: tom slick] #5260516 11/07/19 07:50 AM
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WyrTwister Offline
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Originally Posted by tom slick
I’m curious how pouring cold oil into the engine gets in hot rings. It must jump up from the sump!

Kind of what I was thinking .


Wyr
God bless
Re: Really? Brittle rings and cold oil??? [Re: ls973800] #5260522 11/07/19 07:54 AM
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atikovi Online Content
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Originally Posted by ls973800
That’s why I do my own oil changes, and always let the engine cool off at least one hour while letting every last drop of old oil drip 💧 out into the pan


I just put my bottles of oil in the microwave to heat it up first before pouring into the engine. No thermal shock then.

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