MCS R56 - 5w30 or 5w40 oil in hot climate?
I have an MCS R56 with ~145,000 kilometres on the clock. I live in a country where summers are hot (+40'C is quite normal) and winters are quite mild (we just had 2 days of snowy weather after a few years of no snow at all). I need to replace the engine oil in both my R56 and my R50. I have been using the recommended Castrol, and then recommended Shell 5w-30 synthetic oil. However, now that I need to change it, I hear different suggestions:
1. Put Shell Ultra I 5w-40, since it's a bit thicker and better for our hot climate
2. Put Motul Competition oil, its the best (no grading was recommended at the time)
3. Put Shell 10w-60, it's good for BMW M3, it will be good for MCS (a guy uses it in his MCS chipped to 205hp)
4. Stick to 5w-30
I have noticed this ticking sound after driving it for several hundred kilometres during summer, some people say it's because of engine oil becoming lean, so they recommend a thicker oil. Here's a video I made, try to listen to the audio:
What is the reason for this and which oil should I use, especially since I plan to chip my car to ~205hp as well?