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Synthetic oil is more apt to internally burn off in a high mileage engine.
You don't show the typical symptoms so why not try a change to a conventional or semi synthetic to see if the consumption lessens ?
I'd consider Castrol GTX High Mileage 10W-40 semi synthetic.
You're in a warm climate so the higher viscosity is not a problem.
The oil contains additives that will condition seals.
Mobil has a similar product that reduces internal consumption.
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