hello, i have a mazda 3 2011 doors, sedan, i have been using synthetic engine oil 0W-20.
now my car has 209k.
one guy from oil change place tould me that i should get 20-40 oil. and i dont know if that type of oil is good.
do you know what type synthetic engine oil should i use for my car?

 

Whoever told you that is an idiot. 0W-20 is the perfect oil for your car. As for which type of synthetic, it matters not, any 0W-20, regardless of brand, will serve you well.

 

my car has 209k
ow-20 is good for that mileage

 

Absolutely; what makes you think it wouldn't be?

 

Don’t rely on the oil change place, I went to one that argued with me about the model year of my car.