Is the Pennzoil 10w30 synthetic or mineral? If it's made of mineral than that's not really a good choices for a high temp turbo charge engine. Mineral do shear and have lower HTHS (high temp high shear) figure that synthetic oil plus lower flash point too. In the long run it will coke up your turbo and shorten it's life.
IMO the best choice of oil will be POE base stock; oil like Motul 300V, Redline street oil, Fuchs silkrone. Got excellent HTHS, additives package and higher flash point.
2nd choices will be PAO base stock oil like Mobil 1, RP or Castrol SLX.