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Synthetic oil is a good choice, I would use the 5w-30 grade oil. You can go longer between oil changes. I only advise using the synthetic if the oil leak is small. Otherwise if you have to add oil before you are due it can become costly. The high mileage oil is good as well, as it has more detergents in it to clean the engine, but honestly since you only have 45k on it, the regular synthetic would be fine. I personally use Mobile 1 synthetic in my Mustang GT with only 45k on it, so really I like the stuff. You can go 5-7k miles between changes without the oil losing it's viscosity.
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You might try it, I am not sure if there are any additives in it to help with seals. I do know there is more detergent in there for cleaning and honestly, if the leak is really small it's probably not something to worry about. I think I would try something like STP oil treatment to stop the leak first, then use the synthetic. You're choice really if you want to go with the high mileage stuff or not to be 100% honest.
You are very welcome and that seal might even start working over time once it get's some oil into it again.
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