I do 3K miles with my H/K's.
Originally Posted by donnyj08
+1 In the case of owning GDI or TGDI engines I think it's best to just follow the manufacturers Severe service intervals. Most people would be best served following their manufacturers recommendations. In the case of Hyundai/Kia recommending 3,750mi intervals It would seem they are spot on with most UOAs of their GDI engines toasting the oil by 5k miles or less. Well running port injected engines are capable of much longer intervals. Our escape and Silverado have no trouble running 7.5k+ intervals. I will do a UOA on our new to us T-GDI Hyundai in the near future to get an Idea of the OCI boundaries on it. I'm guessing by Hyundai's Severe service recommendation of 3k miles on the 1.6T-GDI using an ACEA A5 oil, it's going to destroy quality oil in 3-5k miles. Time will tell.
Originally Posted by bbhero
I have looked over many many of the UOAs... And the GDI motors and the turbo boosted motors that are GDI are typically killing oil in short order.... High fuel levels... And oil viscosity way, way low because of that... Versus a car like mine that is port injection and naturally aspirated.... Or say in comparison to the older Toyota motors which are port injection and NA and those UOAs do look great out past 10k miles... Those motors we're much, much easier on oil than a lot of these newer motors that are GDI or TGDI....