How will 5w-20 motor oil affect or what will it do to my 1998 gmc sierra z71?
Didnt realize i had changed my oil with 5w-20
instead of what its suppose to have which is 5w-
30 untill i had already poured almost all of it in.
Possibly an increase in oil consumption. Top it off with 5W-30 if you need to.
That depends on if it is convential or synthetic oil and where you reside, if it is synthetic I doubt you will notice much difference, but convential a could give you a lower oil pressure reading when warmed up, so keep the RPM's down and avoid engines loads, just to be on the safe side you might consider adding a quart of Power Punch to the oil, that should make it last till the next scheduled oil change and you won't loose the oil already in there. HTH
It is winter and if it is cold where you are it should be ok- depending on the condition of your tired old engine-
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