Last November I bought a highly discounted left over 19 Nissan Sentra s 6 spd with 29 miles on it. Which now I have 15500 on it because I drive a lot for work as a Biomed. The manual says to run 0w20 at 5k intervals no matter what conditions. But I remember lurking on this forum a lot of Nissan engines are hard on oil. Plus when I change it the oil is very dark for a new car. Plus it’s an mra8de 1.8l engine with a timing chain. Do you think it maybe worth it to switch to a 5w30? I like the car albeit it’s very slow. But it has a lot of space inside and room to carry my tool box for work along with everything else.