These engines with cam actuators are designed to run on synthetic oil. Synthetic oil doesn't sludge up like dyno oil. If you stretch your oil change intervals more than 3000 miles with dyno oil it will sludge and gather inside the actuators. Only solution then is to change the actuator. Simple one bolt one connector procedure. Remember the oil monitor is calibrated for synthetic so don't follow the oil monitor if you use conventional oils.
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