What to follow API or ACEA rating?

[Ry_Tower]

Not as good as the old API SP for LSPI though, which is important for old-school turbocharged engines.

Wear/sludge/deposits can all be solved by changing the oil regularly.

The new stuff seems good for newer economy-focused engines run on an extended oil-change cycle.

This is indeed the trend nowadays. Good for marketing of their cars as well kasi.