I used Motorcraft 5W-20 semi-synthetic for the first 80k miles. Since then, I've been running Castrol Magnatec 5W-30 full synthetic and the engine's currently at 103k miles. I change the engine oil/filter religiously every 5k miles and the oil level hardly moves.
After I installed oil catch cans some five years ago, I noticed the engine oil stays cleaner for longer. Therefore I'd highly recommend a driver's side catch can at any mileage (a passenger side catch can is overkill but it's a bit more underhood bling.
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