I never broke the motor done or check specs but my brother had a 2001 ford focus. That was the start of the 5w-20 thing for ford if i remember right.

At the time it was hard to find a full synth. oil in 5w-20.

So i changed over to 5w-30 no problems then next oil change i went with a 5w-50 and had a knock.

Switch right back to the 5w-30 kock went away.