I was doin research here last summer, and my questions were anwsered. But a new 1 aroise. I live in vegas, so its pretty warm here. I was told to use 10w-40 in the summer while its hot. Well i kind of slacked on doing the change earlier this summer, but today it needs to be done. its mid august now, and wondering if its still ok to use the 10w-40 for the next 3 months... because itll cool down a bit by november. not sure if the heavier weight will still be ok