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the w means warm......so 5w-30 means it's 30 weight when cold, and 5 when warm. If you run 5 or 10w-40, you probably only notice sluggishness during start up and when it's cold. The good thing about high viscosity oils is that the oil stays at the top of the engine longer. Are you sure it's valve related ? It sounds to me more like rings, if you're burning oil, but less with higher viscosity oils. You need to do a compression check, first and foremost. That will tell you a lot right there. If it's your rings, you obviously have no choice but to replace them in order to quit losing and burning oil. If you don't have the money to replace them right now, run the higher viscosity oil like you are now, or add some Engine Restore, or Engine Honey. But that only helps slow down the oil loss. If you end up needing new rings, and you do it yourself, replace the main bearings while you're at it. They are cheap, and it will be well worth it later down the road.
Good luck,
Mike
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