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The smell is probably the usual cosmolin baking on the engine. It's a grease the factory puts on the engine to protect the aluminum from oxidizing. Cosmolin is the same stuff used on guns and other stuff stored for extended periods. It's a thick type of grease that stays on pretty good even when heated repeatedly like you have noticed on your car. 11 years on my car now and it still bakes the cosmolin for that smell.
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