It always seems like it’s the older crowd in the hobby that balks at synthetics - what gives ? 0w40 Mobil FS has zddp levels comparable to SD rated oil circa 1970 . Modern zddp formulas don’t brake down as much so not as much is needed . 0w40 Mobil is a thinner 40wt on the scale and sounds perfect for these engines . I’m torn between using it or a penn grade product that’s designed for cars that sit .
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 When I wore a younger man's clothes
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