The truck has always ran synthetic oil at 5000 km OCI.
Pretty clean!!!
Absolutely. The varnish seen under the valve covers is the very same varnish that sticks the piston rings, and results in blowby, oil consumption and oil contamination. It is also the very same varnish that damages valve stems, oil pumps, oil pickup screens and so on.It's nice and clean but are there any real benefits? If oil had been changed half as often [ OCI 6,000 miles], would there be more wear?
Time and money would have been saved.
Everyone makes their own choices. It sure doo look goood!
+1 on that. If there is varnish in areas that are visible, then there is definitely varnish in areas that aren't as easily accessible.Absolutely. The varnish seen under the valve covers is the very same varnish that sticks the piston rings, and results in blowby, oil consumption and oil contamination. It is also the very same varnish that damages valve stems, oil pumps, oil pickup screens and so on.
There is absolutely no question that a well maintained engine lasts considerably longer, and will likely have zero internal repairs.