My 07 Civic has 150,000 miles. The manufacturer recommends 5w20, but for the most recent oil change, the mechanic used 5w30. I assume they just did it because it was convenient, but I am wondering if it is actually a good idea to go for a thicker oil at this point. The car is getting older. The 8th gen. Civic is prone to engine problems, and I live in a hot climate (summer highs regularly exceed 100f (38c)). Any thoughts?
In my vehicles, not a civic, but calls for 5w20, while I will run that in the winter, I run 5w30 in the summer because running 5w20 in the summer I find myself adding oil more often. For me, thicker oil for summer, thinner oil for winter.