Brother,
I also like 5/40
In my recent threads, I've mentioned that 5/40 is the new oil in the market and every company has launched its brand. Its neither as thin like 0/30 or 5/30, nor its thicker like 10/40 or 20/50.
Hence best oil to use for new ~ medium life gasoline engines.
And most importantly, if you can find PTT Performa 0/40, JUST TRY IT FOR SURE. You will forget even Zic XQ, ZIC OW, liqui moly's synthenol, or any similar oil.
Ptt Performa's 0/40 costs same like Zic XQ. i-e Rs. 3800/4L BUT PERFORMANCE IS UN-MATCHABLE.
Cheers.