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If you used regular oil the first year semi-synthetic 2nd and then just synthetic in a 2001 I4 Honda Accord can go back to oil?

It is generally not recommended to switch back to a lower-quality oil after using a higher-quality oil. Synthetic oils provide superior lubrication and protection compared to regular or semi-synthetic oils, and switching back could potentially have negative effects on your engine's performance and longevity.

Here are some potential risks associated with switching from synthetic oil to regular oil:

* Increased wear and tear: Synthetic oils have superior lubricating properties that reduce friction and wear on engine components. Regular oils do not provide the same level of protection, which can lead to increased wear and tear over time.

* Reduced performance: Synthetic oils can help improve engine efficiency and performance. Switching back to regular oil may result in reduced performance, such as decreased acceleration and increased fuel consumption.

* Oil sludge formation: Regular oils are more prone to forming sludge, which can clog oil passages and restrict oil flow. Synthetic oils help prevent sludge formation, but switching back to regular oil may increase the risk of sludge buildup.