My car takes 0W-20 motor oil and I would always take my vehicle to the service center dealership to get an oil change that was offered when I purchased my vehicle. 🚗 I went already 4 times so if I go again I’d have to pay this time & because the dealership was far I just decided to go to my local Walmart. I noticed since then that my vehicle is a lot more louder instead of the usual smoothness after an oil change. It’s also been getting down to the low 30sF and sometimes 20s Degrees Fahrenheit since I live next to a lake with lots of trees. The same vehicle sounds a lot louder with the cold start and takes longer to heat up. I went back to Walmart and found out they actually used 5W-30. It’s been 3 weeks since the oil change. Am I able to change it back to 0W-20 or is the engine like compromised or something?