oil conversionon 2001 Civic

I want to convert my 2001 Civic to a synthetic oil right after it runs out of the manufacturer waranty, which is about now…. The recommended oil is 5W20
But right now there is Mobil 1 on ‘sale’ for $4, but they don’t have 5W20 they have 0W20 and on the box it says that it “Recommended for Ford and Honda 5W20 service”
I was changing oil in that Civic way too regularly…. Do I still need to run it with flushing oil or just straight replacing regular oil agter a good ½ hr drain is enough?
I’d just hate to ruin the engine because of some junk got dislodged into the oil after flushing it.

Thanks,

you can run 5w30 in your car just a little thicker, the only thing is change to a semi synthetic before full because full syn and regular oil foams, it's kind of like oil and water! but when you do fully change over use royal purple thats what i use!

what would happen if you changed over to full symthetic right away.
never though oil was that complicated

I am glad i read this, I have to change my oil and I want to change it to synthetic oil. But all I could find was semi-synthetic in 5w30 so I bought it. Glad to know I made a good decision after all.

Thanks, I guess it’s a good idea to rung semi synthetic first (isn’t it a mix of synthetic and regular oil anyway?) but I would not run 5W30 especially in the winter.
Thanks again.

Full synthetic doesn't foam. Conventional does.
just have the engine warm when you drain the oil.