I have a 2007 Chevrolet Express 2500 (8,600# GVRW) with a 4.9L. It has 85,000 miles (135,000 km) on the clock. It is in need of some preventative maintenance but aside from that runs fairly well. It is being used as a work van, getting used daily hauling around tools and supplies (500+ pounds) and racking up the miles. Of course it will get neglected getting regular service hence the reason wanting to switch to synthetic in order to get higher OCI. I am looking on getting some recommendations on what oil to use (5w30), thinking PP or QSUD just because they usually go on sale and easy to get anywhere. Should I be worried about switching to synthetic on an engine with this mileage? The oil cooler lines are beginning to weep, which is pretty common, aside from that it looks pretty dry.
Any help appreciated!
Any help appreciated!