Forgive me for cross posting from the diesel section, but this is a general issue. Due to a shoddy, and unnecessary, previous head gasket replacement, I'm experiencing the fun all over again. This time I got an OEM head gasket and was surprised to find that the new gasket is MLS (multilayer steel) (the original p/n has been superceded several times) I know MLS gaskets are superior in many ways, but I've heard they're very picky about flatness and low-roughness surfaces. While I have had the head resurfaced, I wasn't expecting an MLS gasket so I didn't pay any attention to the finish the shop created. I also have no real way to resurface or even measure the block's flatness (short of pulling the whole engine - but this is my DD and I've been already down for a week). So, am I in for trouble with this MLS gasket, or does Toyota know best?