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The function of the oil is to protect from metal to metal contact. The oil will eventually shear and break down. This will then allow for metal to metal contact. If there is metal to metal contact, your engine temp. will increase and can warp parts, therefore permanently lowering efficiency of the engine ( and fuel), and or lead to more costly engine failures. If you have trouble remembering to change your oil regularly, I reccommend using a synthetic oil. Synthetics protect better and increase your oil change intervals.

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Q: What happens when you don't change your engine oil?
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