Any body with WWII will tell you about dust and oil
Hi Joh
Yes, I have heard of lightly spraying an engine with oil to make it look nice. But normally you cleaned the engine first. The light spray of oil was to prevent rust and make it look good.
But anybody with CMP will tell you about the layer of dust and oil that will build up over time on an engine if you can not clean it off. Half an inch thick crud is not uncommon.
Cheers Phil
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