Is going from synthetic oil in my '03 HOnda Hybrid to regular oil bad?

Over 100K miles, always used synthetic oil. Took the car to my mechanic to have brakes checked, and he thought the oil looked dirty so he drained it and put in regular oil. Now I'm concerned about my engine. Advice please? I do not know what kind of regular oil he put in.

No worries modern oils are compatible - you can go back and forth between synthetic and regular oil with no ill affects.

Check owners manual if it requires synthetic oils. I'm a huge fan of them, as they work very well and don't wear out (just lose additives and get dirty). I'd drive it a while and do a shorter than usual oil change interval

I took the car to the Honda dealer. He said no worries about the oil, but it would be a good idea to change it back to synthetic oil after about 2500 miles. Two techs at the dealer verified that.

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