Ticking sound is normal from a health diesel engine is normal.
Diesel engine that does a lot of towing or carry large payload can use a head adjustment every 2 years or 24,000 miles.
I would keep tabs on the valve cover for oil leak.
Take it in the shop when the valve cover start to leak.
Do the valve adjustment,the valve cover and oil change at the same time.
Shell ROTELLA T Multigrade SAE 15W-40 is my prefer motor oil.
Nope
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