Is there an oil brand you would recommend for a Buick Enclave? It has the infamous 3.6l high feature engine that is known for timing chain issues, owing to poor crank ventilation causing issues with sludge, heat and poor flow. Is there a good oil out there that might help with this. I usually use Pennzoil Platinum or Mobil 1, but I have heard Pennzoil can be prone to sludge?