Switching to full synthetic... When.....

So my Benz is dead,we were able to pick up a 2018 civic with 20k miles from the local Honda dealership.
The oil in it looks new. But when it's time to change it does it matter if I do full synthetic with 20k miles.
I'm thinking it won't hurt at all.

 

Agreed^^^^. I’d be surprised if it isn’t using synthetic already.

 

From what I can find all variants of the 2018 Civic run 0-20 synthetic.

 

Yeah Im finding the same. Looks like full Synthetic is what ill be throwing in it in about 5000 miles.
Slow little car and the CVT trans is interesting but its something reliable for her to drive to work and something I wont have to work on too much,

 

Yeah, my parents rented a Civic on a recent trip and hated the CVT. Also, I didn't think those 1.5T engines were super reliable, though maybe they've gotten better since they were first produced.

 

theyre good little cars, just watch for oil burning. it plagues all the modern 4 cylinders. 5k mile intervals will really help prevent that from being an issue. its the extended intervals with 0 weight oil that causes the rings to eventually seize and allow blow by

 

Being in San Diego I was going to Run 10-30 in it.

 

Ehhh, I wouldn’t. Going that much heavier will affect how the vtec will function. The engines designed to work with 0w-20. 5w-20 isn’t a bad idea


Heavier oil can have weird side effects on new cars

 

No issue at 20k. Just don’t cheap out on the filter. Synthetic can be had at a reasonable price at Walmart, if you’re gonna DIY.