Hello Pat
I use 1 qt motor oil and top the rest with Marvel in both k241 and k301.I also add it to five gallons of premium gas as per instructions on the label.
I have used it to free up seized piston on Briggs motor that was said to need torn down and got many hours of good use from it.
I can't prove it helps slow down engine wear but it doesn't hurt them.My snow blower pull starts easier in winter when added to the oil.
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