I own a shop that does normal repairs but never have come across this question.

Can you mix regular oil with synthetic oil?
I have always been lead to believe that you can go from regular oil to synthetic if you do a engine flush, but I have heard that once you go synthetic it is not a good idea to go back to regular.

Is this just a myth?

I know on some cars you can run regular during the hotter months and then go to a synthetic in the colder ones because it does not break down as quickly but what about my dsm?

Info on the car:

1995 Eagle Talon TSI, guy I got it from said he was running synthetic so I have been doing the same but I have a pretty decent leak and dont have time to fix it right now and it is getting pretty costly.

Thanks in advance DSM guru's!!!!!!! The force is strong with you all.