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 - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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