A friend shared these before and after pictures of his 2013 Chevy Cruze 1.4L turbo. He purchased the car with 67k miles and used Valvoline Advanced 5W-30 until 137k miles. He then switched to High Performance Lubricants HDMO 5W-30 and currently at 140k miles, 3k miles on the HPL. The first picture is at 137k miles before the switch the HPL. The other 2 pictures are current after 3k miles with HPL. The Valvoline was run at 7,500 mile OCIs.
Before
After
Before
After