Delo 400 XSP SAE 15W-40 with ISOSYN Advanced Technology is an API CK-4 heavy duty engine oil specifically formulated for on-highway and off-highway applications including 2017 greenhouse gas (GHG ...

I'd remove valve cover when you need to adjust valves or if you have a leak. I don't like using full-synthetic cuz it's expensive and doesn't drain as well as others and tends to collect dirt up ...