https://www.youtube.com/watch?v=TevK-u3vkx4&t=85s
I used to be the 5k OCI type, but then several years ago, I started reading about longer OCI on BITOG. I decided to experiment with longer OCI(10k or even 12k) with full syn, even trying Amsoil. More recently, I noticed some varnish at the oil fill hole and the car consuming about 1 quart every several thousand miles(每幾千英里吃掉1夸脫機油) on my 2009 Prius. I recently discovered that these cars are notorious for sludge buildup in the piston oil control rings.(活塞環油泥堆積) After watching videos like The Care Care Nut and Ford Boss Me, I decided to go back to 5k OCI.