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In defense of Mobil 1, unlikely the oil itself is the problem for consumption. If you are blowing (no leaks) 1 quart per 1300 miles this is still within normal.
Do switch back to a good dino, such as Shell Rotello or Chevron Delo and see what happens to noise. Mobil 1 is NOT the best at high temp. viscosity.
Sticky valves? Noise, hard starting, if at the valve/seat interface low compression numbers/leak down % high out exhaust....
Not sure it's 100% fixed in any white engines, but I think the mechanism to spin valves in seats works better - hence the need for you to do the occasional "Italian tune-up"...
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www.fidalgo.net/~brook4
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