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Cold start engine wear? #5236747 10/11/19 09:10 AM
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Rglossip Offline OP
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If the statement that" most engine wear occurs at startup" is true , shouldn't we run lower viscosity winter weight oils if your diesel is in a cold environment at startup? I know there are engineers and motor head guys here and I am curious about your thoughts.

Re: Cold start engine wear? [Re: Rglossip] #5236755 10/11/19 09:18 AM
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BrianF Offline
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In a couple more years I should have a few more UOA under my belt to show how semi synthetic 10w30 works year round in my ISB6.7. I only have 2 so far on a relatively fresh engine.


2006 Trailblazer LT. QSUD, Fram Ultra.
2017 Ram 3500 SLT Megacab. Duron SHP 10w30, Baldwin BT7349.
1993 GMC 1500. QSAD, Fram PH5
Re: Cold start engine wear? [Re: Rglossip] #5236762 10/11/19 09:23 AM
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. The cold and warmup phase increased wear is much more than just the oil. We have 5W and 0W-XX oils on the market now. Cold start and warm up wear is caused by fuel wash down in the cylinders due to less than ideal combustion. The pistons are oval when cold, measure them so there is more blow by washng the oil from the cyl walls. The metals have not expanded from the heat so the engine is looser. Looser equals more wear etc. Also some of the additive package elements workbest when hot.


2015 F150 2.7
2018 F350 6.2
Re: Cold start engine wear? [Re: BrianF] #5236766 10/11/19 09:26 AM
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Your numbers would be important living in Canada.Look forward to seeing them.I presume it gets hotter in Kansas in summer. That 30 number has me concerned for August. My tractor is an hst and I run it at about 2000 rpm .In alot of ways it operates like a gen set.

Re: Cold start engine wear? [Re: Rglossip] #5236775 10/11/19 09:34 AM
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Originally Posted by Rglossip
If the statement that" most engine wear occurs at startup" is true , shouldn't we run lower viscosity winter weight oils if your diesel is in a cold environment at startup? I know there are engineers and motor head guys here and I am curious about your thoughts.

All oil is very thick when not at the operating temperature. There is no wear issue with any winter grade oil unless it is so very cold that the oil gels and cannot flow to the pump pickup tube. A 0W, or a 5W or a 10W or a 15W rated oil at startup will not affect wear. An oil with a better winter rating is not "thin".

Having said that, you do not reduce wear with thinner oils. You decrease fuel consumption with them, and if cold and you make it easier for the engine to start.


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: Cold start engine wear? [Re: CT8] #5236789 10/11/19 09:44 AM
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Definitely didn't know that.I can plug my tractor in.From that perspective that will help alot.

Re: Cold start engine wear? [Re: Rglossip] #5236805 10/11/19 10:08 AM
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Shouldn't be an engine in North America or Canada running if you believe that cold starts ruin engines.

Re: Cold start engine wear? [Re: Rglossip] #5236807 10/11/19 10:10 AM
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rideahorse Offline
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Shouldn't be an engine in North America or Canada running if you believe that cold starts ruin engines.

Re: Cold start engine wear? [Re: Rglossip] #5236820 10/11/19 10:22 AM
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I think we tend to blow the cold start up wear out of proportion here. Modern oils and improved engine designs and fuel management protect engines a lot better against cold start wear than they did a few decades ago. Yes there is more wear when an engine first starts, but it isn't like the engine is grinding itself away every morning when you fire it up. Case in point, when I started driving, a car with 100K was considered pretty much done or due for a some engine work. Engines today can easily double or triple that without any major engine work.


God Bless Our Troops

Re: Cold start engine wear? [Re: rideahorse] #5236870 10/11/19 11:16 AM
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Originally Posted by rideahorse
Shouldn't be an engine in North America or Canada running if you believe that cold starts ruin engines.

Canada is in North America.


2012 Kia Forte EX 2.0 I4 6AT 49k- Valvoline Synpower 5w20
1994 BMW 530i, 5MT 201k M1/Castrol 0w40
2009 Honda Accord 2.4 I4, 5AT, 178k- RP 0w20
2004 BMW X5 4.4l 239k- M1 0W40 FS
Re: Cold start engine wear? [Re: benhen77] #5237083 10/11/19 02:41 PM
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Is that in Merica?
Originally Posted by benhen77
Originally Posted by rideahorse
Shouldn't be an engine in North America or Canada running if you believe that cold starts ruin engines.

Canada is in North America.


2018 Trd Pro 4Runner
2018 Tacoma off-road

Dealer 0w20 to M1 0w40 FS -it depends
Re: Cold start engine wear? [Re: benhen77] #5237149 10/11/19 03:32 PM
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dbias Offline
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Originally Posted by benhen77
Originally Posted by rideahorse
Shouldn't be an engine in North America or Canada running if you believe that cold starts ruin engines.

Canada is in North America.



Canada puts the North in North America lol.


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2012 FORD TRANSIT CONNECT Castrol Edge 5W-30
2016 HONDA CIVIC COUPE Casrol Edge 5w-30
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Re: Cold start engine wear? [Re: dbias] #5237155 10/11/19 03:38 PM
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International Falls for $100, Alex (and yes, I have been there).

Re: Cold start engine wear? [Re: Rglossip] #5238807 10/13/19 08:37 PM
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So do you personally know Richard Glossip?


1994 BMW 530i, 246K
1996 Honda Accord, 280K
1999 Toyota Sienna, 420K
2000 Toyota ECHO, 281K
Re: Cold start engine wear? [Re: Rglossip] #5238853 10/13/19 09:27 PM
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Originally Posted by Rglossip
If the statement that" most engine wear occurs at startup" is true , shouldn't we run lower viscosity winter weight oils if your diesel is in a cold environment at startup? I know there are engineers and motor head guys here and I am curious about your thoughts.
Engineers at Toyota, Mazda, Ford, Subaru, GM, BMW-Mini, Mercedes, Jaguar, and VW-Audi say to use 0w20 in a lot of their engines. They like the "0w" part, and they think the "20" part is OK. They would recommend 10w-30 if they didn't like 0w and 20 so much. --------- Side with them on the issue, as they have studied it a lot. --- Maybe they are afraid of warranty claims when somebody starts up at -20 F. Above zero F, there seems to be little reason to have the 0w cold rating part (could be 5w).

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