Mechanic used different oil weight in my '22 2.5 GT-Line. Should I have him change it out or is it ok?

[Rich_Freakin_Evans]

I took my 2.5 GT-Line in to my trusted local mechanic for an oil change and brake fluid flush. He said at the time of pick up that he used recommended oil weight per the oil cap.

When i got home is was filing the invoice and noticed that he used 5w30. I checked the manual and cap and they state 0w30. Im guessing he either misread it, or maybe was looking at 6cyl recommendation.

I live in the PNW. Temps dont get too low, but can get down to around 25 on a cold winter day.

Should I have him replace the oil? Or use my oil extractor and change it out myself?
Its a CPO car and id like to preserve the warranty. That's really the only reason im not doing the changes myself.

Thanks any help .

 

[Snicklefritz]

Ask the mechanic. He might have done the invoice wrong. Or he might feel his rep on the line and change it out.

KIA could use the wrong viscosity to void your drivetrain warranty if something bad happened to the engine, what, I don't know.

But the reality is that where you live the difference between 0w and 5w when starting cold is negligible. The 30 is the important one because both viscosities behave the same at operating temperature.

If your going to lose sleep over this one, just change it again now and move on.

 

[Rich_Freakin_Evans]

Ask the mechanic. He might have done the invoice wrong. Or he might feel his rep on the line and change it out.

KIA could use the wrong viscosity to void your drivetrain warranty if something bad happened to the engine, what, I don't know.

But the reality is that where you live the difference between 0w and 5w when starting cold is negligible. The 30 is the important one because both viscosities behave the same at operating temperature.

If your going to lose sleep over this one, just change it again now and move on.

So i emailed him and this was his response:

No, its completely fine, I looked up on Mitchell service and it says you can use either weight, and that was for the 4 cyl. I'm not a big fan of using that super thin stuff.

 

[Thomby]

I'm not a big fan of using that super thin stuff.

0w30 is no thinner than 5w30 at operating temp. When both are cold, they will be far thicker than is ideal, but the 0w will be slightly less thick (ie closer to where it needs to be to start protecting things).

Lower front number = less bad when ice cold

 

[JSolo]

Mitchell is not the owner's manual. So doesn't matter what it says. I doubt it will really make any difference through. 5W30 is recommended for the 6 cyl, not 4.

PNW is not like chicago where it goes down to 0F or below in the winter.

 

[oddball]

It doesn't matter.