Received an OA from Blacktstone Labs for my 2012 2.7L 4 cylinder 2TR-FE Toyota Tacoma 4X4 with 95,661 miles, 5,941 miles OCI. Everything looked great except a high Silicon average? Blackstone said in comments possible silicon leaked from a recent repair, or possibly dirt making it's way past air filter? Ok, no repairs. But did notice and remembered during this oil change when checking my air filter lid wasn't securely seated. Didn't think anything of it since I just replaced air filter @ 90,000 miles. Good catch on Blackstone Lab's part, and me remembering the unsecured/not properly seated air filter lid. BTW: my silicon reading was 25. Last OA it was 18 @ 89,720 miles. Universal average is 13. Will post complete OA later when time permits. M1 EP 0W-20.