Re: fuel consumption & valve lube
In my opinion and seeing as I haven't heard of valvemaster before, I would use Flashlube.
My father uses it in all his vehicles, and sells it by the 500mL or 1 Litre bottle.
It appears to do its job very well, and I have used it in my vehicles for over 2 years.
Our local BP servo mixes it in with the premium unleaded as it goes into his tank underground.
It doesn't hurt cat converters, O2 sensors, etc, and the 351 in my XD ute is going as good as ever!
Original XD 351 Ute - I got one!!
HSV - I just don't want one....EVER!
My XF 3 on the tree ute is ALWAYS stuck in third......