if you have been running a good heavy duty oil before, then there will be no difference.
if your running cheap low end oil, then there will tons of difference. The good oils have additives that clean and resist piston ring scuffing, ring coking, deposit build ups.. cheap oil does not.
so if you change, the new hd oils will start cleaning the gunk and you might end up with leaks everywhere as they clean the dirt off the old worn out gaskets. if the valve guides are worn out, the new oil will clean the gunk out then start using oil through the valve guides..
again, if you have been using a good hd oil, then you will see very little change, as the engine is clean and the oils both have the same critical additive packages, so a minor change of base oil will not change much.
Putting this oil in a worn out engine will make it appear to be worse shape.
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Today's Featured Article - Chores - by Frank Young. The ceaseless passing of time! It is at once our friend and our enemy. It measures our progress and it makes us old. Like most features of our life, few things are all good or all bad, and most such judgments depend on our own perspective or viewpoint. In our particular hobby, we enjoy the nostalgic return to the days of our youth as we recreate many of the scenes that took place on the family farm that served as the stage for the first few acts of the play that is our live
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