I first used Redline MTL at about 30K miles, changed again at around 60, 90 and just recently again. Never noticed any foaming. It shifts much easier when cold, as I understand it, with syn oil the viscosity is more consistent over a broader temp rande. Never noted any signs of wear at changes. IMHO, it is far superior to OEM Honda fluid. Have never heard anything bad about it, besides the sticker shock thing