So I currently have the valve covers off to replace the gasket. I noticed a marked difference in the color of the parts under the front cover and the rear cover. I'll attach images. The front looks mostly clean, and has a pretty healthy coat of oil. The rear however is a red / brown color all over, and the amount of oil in there is sparse. There is some oil present but I wouldn't call it an adequate amount, it's pretty dry. My concern is that I have a blockage in an oil line to the rear valves.
