Is it ok to have changing oil viscosities?

[gearhead000]

The reason I asked is I've read several owner's manual and for the newer gen engines recommended viscosities are 0w20 or 5w20.
So I did a quick search with our online shops and they're now quite readily available and more importantly, very much affordable.

Wala kasing 5w20, mas common ang 5w30, 0w20 naman sobrang mahal. 5w30 ako sa 2013 Civic ko.

Used to be talaga na either walang mga 0 and/or 20 weight oils dito sa atin. There was a time ang popular pa nga is 20w50.
I do remember with my 9th gen the recommendation is 5w30, but during that time it was something quite rare thus the use of 5w40.
With the newer generation, manual says 0w20/ 5w20 pero again probably just 3 years ago rarepaps pa dito ang said viscosities.

As mentioned, today they are quite aplenty from the respectable brands, and with prices very competitive with the popular viscosities.
Mamili ka between OEM's like Ford (Motorcraft), Mitsubishi, Honda, Hyundai, Suzuki, or manufacturers like Aisin, ACDelco, Idemitsu, Mobil 1, etc.

IIRC 30 weight oil is only good for up to 30°C. I try not to use anything lower than 40 weight for my cars.

Source: Rymax Lubricants Holland

Also with our climate the "W" rating doesn't matter at all. It represents the oil flow at 0°F (-17.9°C).

If SAE 30 is good for 5°C to 30°C, 5W30 extends the lower operating range to -35°C. It's irrelevant to us.

That chart though is quite an eye opener, though I may still not be using 40 weight on my 10th gen.
It spelled for us in an easy to digest way the usage of these various viscosities, either monograde or multigrade.
I may probably stick with 5w30 going forward. It's only a 0.5~0.7% gain in efficiency with the thinner oils.