What ever the leak flow it will still leak out to fast.

I have found from personal experience that switching to
a thicker oil will slow down the oil burning but not enough
to make a big difference. Though what happens is that the
heavier oil cause deposits to build up quickly and cause
the spark plugs to foul out and need to be replaced sooner.

Heavier oil will never replace metal that has worn away.
Though when you have a sound engine that is often
pulling heavy loads, trailering heavy loads, or living
where the temperatures in the summer is always above
90 and you do a lot of long high speed driving then stepping
up to a 40 weight oil would be a good option. Jeffrey