Ill be switching out the 20w50 petro oil to 10w30 amsoil syn. and a new filter. I use amsoil in all my other vehicles including cycles, except the 1971 landrover. I run 10w30 petro in that one.

Thanks for the ideas. Im thinking my lifters are leaking down at night. But then again once they quiet at speed they will get noisy again at idle after a bit if idling.

12.00 each at autozone sounds reasonable