I use Motul 300V 5W30 for engine oil, been using it for most of my ~37K miles on the car so far. It's a great oil, but you generally have to buy it online and have it shipped since it's not in auto parts stores. The only caveat (well, aside from cost) I'd add about 300V is: it's not designed for long change intervals on a street car. It's got great properties when fresh, but it has a tendency to absorb humidity from the air and turn acidic faster than a "normal" synthetic. I don't ever leave mine in longer than 3 months, sometimes shorter if I've had two track weekends in a 2-month period.
For a street car and possibly longer intervals and more time parked outside overnight, etc... I'd recommend Mobil-1 Extended Performance, personally.
Where I do use Royal Purple is for the rear end, their 75W90 synthetic gear oil.
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