Originally Posted by autosilva
I took my car to get an oil change and they put oil 10w 40 in it.
the next day i read the car maual and it says that i have to put either 5w30 or 10w 30
will this harm my car
what should i do
No, it won't do your car any harm. On the next oil change just go back to whatever weight you normally use. You should probably find a different place to get the oil changes done as well.
Have you gone back and raised hell? You should insist they perform another oil and filter change immediately for free.