I've read a lot of comments about 5w30 used instead of 10w30?

I live in Arizona. These are reasons I've used 10w30. My neighbor worked at the Ford proving grounds. Their petroleum engineer said he personally "... wouldn't use 5w anything in any vehicle he owned.".
I had my Hyundai serviced at local Hyundai here in NW AZ every 3000 mi. The manual states 5w30. The receipt read they used 10w30. They said Winter or summer thats what we use here.. Brand new car being serviced by the manufacturer they wouldn't use 5w in AZ
I change the oil at 5000 now using only OEM filters, but have switched to Mobil 1 high mileage 10w30. There's 90k on car. It has been totally dependable. It doesn't leak or burn a drop of oil. Never a warning light Combined it avg 28 mpg.
If I changed to 5w30 what benefits are possible? The next oil/filter change will take me into fall.
Thanks

thebax20062018-09-15T11:49:55Z

In colder climates you'd want to use 5w 30w oil.
It probably doesn't matter where you live.

00

ponderer2018-09-15T03:19:58Z

You would be putting in what the manual says. If you had a Honda the manual would recommend 5w20 or 0w20 so that is what you use. Whether you are in Arizona or East Jabip. The operating temp of the engine is 190 F
The temp outside in Arizona reaches that? Think.

10

Ordinary Guy2018-09-15T01:53:36Z

unless you are burning oil 5w is better.

10

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