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So I *finally* managed to get 5w30 rock oil competition (major distributor in poland screwed me over by claiming they have 20L in stock while in reality they only had 1L and I had to wait until last friday for remaining 5L bottle). My initial observation is that idle and low load temps are better (similar to 0w20 I had before) while high load temps seem to be about the same as that 10w50. "On paper" it looks fine. Though OEM gauge still shows about 118 deg C on my way to work (245 F) but this oil advertises 3.7 HSTS in 5w30 variant so I believe it should be fine even for daily use at those temps. Especially if OEM shows higher temps as KillerBMotorsport mentioned, it sounds safe.
Though what was quite interesting to me - engine is noticeably louder and sounds harsher than with 10w50. I already noticed that when changing from 0w20 to 10w50 (back then I noticed it feels softer) but now changing back to 5w30 just confirmed my initial impressions. I don't think it's good or bad but I was just a bit surprised by fact that such minor thing as oil may affect engine vibrations and sound. But since oil directly affects resistance of parts movement it kinda makes sense I guess.
Well... at least due to this hardcore delay in delivery I managed to make 3k km already (1800 miles) on that 10w50 oil so it wasn't entirely wasted purchase xD
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