5w-20 in hot weather?
 

So i was just wondering. I know the recommended oil for the outtie is 5w-20. But during driving in hot weather, doesn't that grade breaks down more and you would have to change the oil more oftern?

Did anyone tried a thicker grade? 5w-30? or similar.

RE: 5w-20 in hot weather?
 

5w-20will not necessarily break down faster, it will justhave a lower viscosity when it's hot. Synthetic oil will take longer to break down, and you can get it in 5W-20 or 30.

RE: 5w-20 in hot weather?
 

The Used Oil Analyses I've seen on 5w-20 show that it holds up pretty well, Probably becaue it has to.

But I don't think using 5w30 is a bad thing either, especially in hot weather and if you're going over 5K on the intervals, or if you tow

Right now I'm using M1 5w30, mostly because I had a jug of it left over..no problems.

RE: 5w-20 in hot weather?
 

We have 15000km service interval.
Dealer use 5W-50 or 0W-40 synthetic Mobil-1 as "all-season" engine lubricant.
I attach SAE recommended table
[IMG]local://upfiles/15495/F39C910242EF49D48DB412B366422CD8.jpg[/IMG]

Sorry for it quality but as I know second number after "W-" inclass defines average "summer" temperature for this oil.

[IMG]local://upfiles/15495/34FE3BE100E14D978916C43B1678B495.jpg[/IMG]

RE: 5w-20 in hot weather?
 

20 weight oil is a North American Phenomenon..one that only gains about 1% in fuel economy over 30 weight..in Europe you see a lot of cars speced for 40 weight

RE: 5w-20 in hot weather?
 

oh ok cool b/c one of the mitsubishi mechanic said 5w-30 is suitable for hot weather like houston/miami, etc. and 5w-20 for cold states and fair weather.

sergy said you can use 5w-50? holy moly...

imma gonna try 5w-30 next oil change.

RE: 5w-20 in hot weather?
 

I think the reason why most European dealerships or service stations use a 40 weight is because it's usually recommended for diesel engines, and they apparently only want to keep 1 grade of oil.
I would assume you can get a small performance gain by using a 30 weight instead of a 40, unfortunately I won't get to try it, my dealership will stick with 5w40 I guess.
Nowadays these lower viscosity oils got much more stable I assume, and the engines are designed for it.

Side note: As most of you know many EU countries "promote" diesel-powered cars by imposing much more tax on gasoline than on diesel; what explains the success of these cars.

RE: 5w-20 in hot weather?
 

Diesel at the pump cost more than petrol now, the reason we buy diesel is more mpg I am getting 42mpg my old shogun sport did 25mpg and my outlander has a smaller fuel tank I am saving a round £20 every time i fill up.

I had to fill the shogun sport every 280 miles and I fill up the outlanderevery 480 miles

Puddy

RE: 5w-20 in hot weather?
 

But why? Can you explain, please?

Wehaven't achoice petrol or diesel Outie. Gasoline only. 5W-40 or 0W-50 as motor oil. 15000km service interval.
Why you wondered?

RE: 5w-20 in hot weather?
 

IIRC 5W-20 not only has a lower viscosity thus improving efficiency (not by much), but it also has a higher flash point, or lower volitilty (sp?). There is supposed to be less burn off of the oil during operating conditions, thus lower Hydrocarbon emmisions. Again, it is likely so little that we would be hard pressed tosee the effects on the enviroment from our individual vehicles, but when you add up millions of vehicles, the effect is real.