0W-20 vs 5W-30 for hot climates? Why both viscosity rated for hot climates?

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I am independent AMSOIL dealer. 
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[Bellakelpie]

I live in Australia, where summer temperatures can get up to 110F or more. I use OW-20 in a European car, that I drive and 5W-30 in an Asian car that my wife drives, without any issues.

With modern synthetic oils, those low viscosity oils are fine.

The "experts" who claim that these oils are not suitable in heat, still have their heads stuck in the days of old fashioned mineral oils, where thinner oils were not recommended for use in hot climates.

Just keep the oil changes up to manufacturers recommended intervals, or even earlier, and you won't have a problem.

[Azureecosse]

I ve been using 0w20 for five years on my car I live in an extreme climate ( very cold in winter and gets hot in summer) I live at a high elevation, I do 20, 000 miles a year and one third of that is towing a horse box, no issues, car ( SUV) gets a regular service at the dealership, Engine mileage around 125, 000 miles, engine sounds sweet but it is a Landcruiser.

[kennethwatt]

2010 Camry changed at 5K, because of miles now doing 3K mile Oil in miles @ 50 Plus a Oil added between

[emadalkahroosi]

Finally someone talked about this. I use 0w20 on my 2015 camry and the outside temperature 🌡 is almost 50c 😅

[JRSonOfRichard]

I understand what you're getting at. But engine oil gets hotter than coolant temperature in many cases, for example under hard acceleration and turbo and GDI engines. 240-250 degrees are common. Luckily even conventional oil can handle 250 degrees in most cases. PAOs up to 400+. There are hot spots in engines, turbo bearings/shaft, and areas in the cylinder heads. Yes, the coolant system greatly reduces these temps and thinner oil runs cooler because of increased flow throughout the engine, but thinner oils rely on viscosity modifiers. VMs get sheared by gears, chains and sprockets, and by the oil pump itself (rotor or gear type) . Fuel dilution can become a problem with GDI and modern low tension rings. People have to understand that oil technology has advanced tremendously since the 20w50 days. I use 0w20 in some vehicles, but others 5w30 regardless what the manufacturer recommends. Ambient temperature does play a role, like the old days. I live in Phoenix. Its extremely hot, and in traffic oil temps rise, engine and transmission. This is very noticeable in a shared sump engine such as a motorcycle. As the temperature goes up, the transmission gets notchy, and the engine is less responsive. Of course wet clutch shared sump trans/engines shear oil worse than anything. That's why they have higher viscosity from the start to compensate. If you have a engine that has timing chains, or turbos, change your oil sooner. Many oils will not stay in grade over 3k in these.

[johnf.]

I live in the desert where temps hit 120’ degrees and as low as 20-25’ in winter. My car says use 0W -20.. I thought the same thing but so far so good with that weight..

[AlDVP]

Thank you for the great info and post. About time someone did a post like this. One thing that fuels this 0w20/5w30 talk is that people say same car has different viscosity requirement in different parts of the world depending on climate. Also older car manuals has different viscosity requirements depending on season.

[cwhit]

These motoroil weights are popular in Thailand. About as hot as you will find. Heavy stop and go traffic with AC loading all day long.

[truthseeker]

Thanks for debunking another myth, people are spreading use 0w40 in hot climates and whatnot.

[uo]

06 CVPI Ford says 5W-20. I considered 5w-30 but never did. 258k miles runs great doesn't burn oil so I'm just gonna use what manufacturer recommends.

[nicholasdalessandro]

THANKS A LOT FOR CLEARING UP THIS ARGUMENT WITH FACTS

[drowsy]

For my 2021 GMC 1500 with V8 5.3L it recommends 0W-20 on its oil fill cap. For me (living in -40C / - 40F winter months climate), I use 0W-20 Full Synthetic Dexos-1 during winter months and switch to 5W-30 Full Synthetic Dexos-1 during hot temp summer months. I also DIY change my engine/Oil Filer when its usage meter show 35%-30% remaining oil life. This works for me (and my GM's sensitive engine).

[philipeli]

0w-16 in my hybrids up here in north dakota.Amsoil has the best 0w-16, toyotas oil is good too.

[DavidDiPierro]

Finally,
Someone who trust science and figures rather than making up stuff to fit their barbaric and outdated narrative .
Great content!

[christophergomez]

hello from Dominican Republic.

I recently bought a Toyota Vitz imported from japan. the engien hood says 0W16 and the manual too. my car is only 61, 000 KM. i always used 0W16 and my country is really hot up to 38 C.

Manual says 0W16 from manufacture and 0w16/0w20 for best economy. and up to 10W30.

in the summer i will switch to 0W20 always Toyota OEm Oil Full Syntethic

Many mechanics say to use 5W30 for my country. but my mechanic told me to continue using 0W16 or 0W20 since my engine is designed for that viscosity.

[FreeKanal]

It gets to thin because of fuel dilution and the GDI system is the cause not oil weight. People dont change oil in those cars and then blame oil.

[bobdole]

Do as you please.Ill use 5w30 in my 2024 Nissan truck regardless.

[LORD_OF_THE_ROOTS]

Absolutely 💯 a slightly thicker oil in summer is better. That said thinner oils of today are also good enough. I've always stuck to 0w-20 in winter. 5w-30 in summer. My engine has 300k on it still runs like a scolded 🐕

[jd]

I switched to a thicker oil to test it out and the thicker oil actually burned more than the thinner oil

[vwbora]

The temperature of the oil sump, is not what oil will encounter else where