PYB 10W-30 has NOACK in the 4 range, ultra low, and from my understanding lower NOACK would mean lower likelihood of carbon buildup. I agree that in a general sense PP and PUP have more cleaning elements in their formula but they likely do little to nothing that would mitigate carbon buildup and having higher NOACK values suggests that they are more susceptible to contributing to carbon buildup. I would be perfectly happy running PYB 10W-30 in my Hyundai GDI for 5000 miles outside the winter months.
Originally Posted by Triple_Se7en
What are the Noack numbers for 5w/10w30s Pennzoil Yellow Bottle? Keeping that engine clean is also important with GDI/TGDI engines. Pennzoil rates their oils this way... Pennzoil Yellow Bottle One Star Pennzoil Platinum Two Stars Pennzoil Ultra Platinum Three Stars
Originally Posted by Ignatius
PYB 10w-30 is the only conventional I would consider using in my Hyundai's GDI engine and that is only because of that oil's low NOACK rating.