I have a 350 small block of 1981 vintage in my AD,I'm finally getting round to changing the oil,the stuff in it was only intended as a flush through as it had been sitting a while.
I have never been inside the engine as it doesn't smoke,knock or rattle and makes good oil pressure 50psi cold 20 hot so it didn't make financial sense to me to rebuild it.(If it ain't broke don't fix it")
Long story short that was over a 1000 miles ago!
I'm having a heck of a job sourcing a standard mineral oil locally,the Corvette manual calls for a 5w-30 or a 10w-30,I can only get these in a semi synthetic round these parts,will this be OK?
