I didn't have my reading glasses on the other day as I checked the oil cap filler on my 2007 Silverado Classic (5.3L Flex). What I bought was a case of Mobil 1 10w30. (always used Mobil 1 since new).

Of course, when I got home I saw the error of my ways to read the cap's (5w30). I changed it and re-filled with the 10w30, but of course, I feel dumb about not getting it right. Especially, here in the cold north of MI.

The Truck is an excellent, never touched 160k motor, with zero issues and I drive it all winter.

Should I dump it and install the correct 5w30? Or am I fretting about nothing?

Thanks, RPG

 

I wouldn't worry about it.

 

It will be fine. 10w-30 is good down to -15 or so 5w down a little further.