Any thoughts on this?
It's a different formula compared to most engine flusheshttps://www.castrol.com/en_au/australia/products/other-products/engine-flush.html
Not available in the US I have heard
Interesting claims by another site promoting it especially number 3
-Remove sludge and dirt from engine parts
-Help maintain engine power & efficiency
-Prevent contamination of fresh oil by residues left behind