@TheWonderful90s Snowman , just go away and find a forum that will agree with your nonsense.
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All he seems to know s NONSENSE. 
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Wrong again!
The 10W is the winter viscosity down to 0 degrees of that multi-weight oil.
That means it flows faster at 0 degrees than that SAE 40 at 50 degrees.
Tester
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So what? You want lower viscosity at start than a single grade would provide.
Multi weights have been specified by all makers word wide for decades, regardless of climate. Are you saying theyāre wrong?
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You are starting to sound like @Robert-Gift , and that is not a compliment.
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Letās stop feeding him. maybe he will go find another food source.
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I would not use single weight oil in my lawnmower or snowblower, nor my car.
They donāt want people driving north and forgetting that they have a single weight tropical climate oil in their engine is what I would assume. Thatās probably as close to conspiracy as I should go.
texases,
That article never mentioned viscosity modifiers, which is how mineral oils, which I guess are called class III, are made multiweight. In the in the early days of engines, I think back to like the WW2 days, before viscosity modifiers were invented, you had to change your oil to a thinner oil for winter use. One of the reasons for this and for using multi weight oils was not so much due to damaging the engine from oil that didnāt flow, but because engines with carburetors had to crank at a fairly high speed to get started compared to fuel injected engines, and oil that was too thick from the cold would make it difficult or impossible to start.
Youāre required to use single weight in many air cooled engines like lawn mowers. Take a look at a Briggs and Stratton engine from the 80s or 90s. The standard multi weight oils could not handle the higher temperatures that those engines run at in the summer. For a 3HP Briggs itās SAE 30 summer, 5w20 winter.
We could get so lucky?
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Youāre required to use single weight in many air cooled engines like lawn mower. Take a look at a Briggs and Stratton engine from the 80s or 90s.
NOT TRUE FROM BRIGGS ANS STRATTON WEBSITE QUIT SPREADING BUULL
Different oil types can work best at certain temperatures. Learn which one to choose for your climat
- SAE 30 - Warmer temperatures, most common oil for small engines.
- SAE 10W-30 - Varying temperature range, this grade of oil improves cold-weather starting, but may increase oil consumption.
- Synthetic SAE 5W-30 - Best protection at all temperatures as well as improved starting with less oil consumption.
- SAE 5W-30 - Very cold temperatures.
- Vanguard 15W-50 - Varying temperature range. For continuous-use, such as commercial lawn cutting or pressure washing.
When choosing lawn mower oil, use a high-quality detergent oil classified as āFor Service SF, SG, SH, SJā or higher. Do not use special additives.
Synthetic oils are an acceptable oil at all temperatures. The use of synthetic oil does not alter required oil change intervals.
Purchase the right oil for your engine at shop.briggsandstratton.com.
*Below 40Ā°F (4Ā°C) the use of SAE 30 will result in hard starting.
**Above 80Ā°F (27Ā°C) the use of 10W30 may ca
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IIRC the correct oil would be 10W-30. The choice of conventional, semi-synthetic, or full synthetic is up to you.
I said a Briggs from the 80s or 90s. The quality of multi weight oils, the availability of synthetic equivalents, and the tolerances in the engines have likely all changed since then. Even today the chart you shared says that 10W30 can result in high oil consumption in the summer, which means itās wearing out faster. But most lawn mowers are done in well before the 1500 hour life of a properly maintained air cooled 3600 RPM engine.
Yes thatās what the manual says, but does the OP want the engine to wear out at 250,000 to 300,000 miles using 10W30 or 325,000 to 400,000 miles using something better?
And you have just proved the meaning of āassumeā.
Show us one site or oil maker or car maker that even mentions single weight oils for modern cars.
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Are we talking about lawn equipment or vehicles here?
Tester
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I thought you might look around the most useful oil web site. Hereās a good place to start:
Motor Oil 101 - Chapter One - Operating Temperatures and Viscosity - Bob is the Oil Guy
Do I need to email them and ask or will you!
Thereās one right here with a sticker that says SAE 30 summer 5W20 winter. Go look at old stuff for sale online and you might see the same sticker.