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Good clean oil is important on the cam lobes. The high loads and small contact area result in a thin oil film. Dirt in the oil acts like grinding compound and wipes out the cam lobes.
I have seen two engines with the cam lobes destroyed. One was a lawn mower engine owned by a man that believed that those small engines could tolerate dirty oil, so he never changed it. The other was a car owned by a man that bought it cheap and ran it into the ground without oil changes.
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