- Aug 2, 2004
Hi guys! I'm currently running Valvoline 5W30 All-Climate along with a bottle of Synpower oil treatment. This is on a '98 Blazer with 51K miles. Should I continue with this or switch to 10W30? Would there be any benefit? Also, would it be wise to switch to synthetic or semi-synthtic at this point? Right now my OCI is 3 months/3K miles. I'd like to extend this also.