Good point on the oil. There is a chart on a site somewhere that compared the Zinc levels of diesel oil. Walmart oil actually came out as one of the higher levels, although that may vary since it may well be "jugged" at regional contractors.
Another option is the high mileage oils. There are a number of them at Canadian tire these days. Most or all brag about their increased levels of Zinc.
You can also add an additive like ZDP. I ordered 10 bottles off ebay which will last my little fleet for a while.
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