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Hi Everyone, I’m a professional driver in Virginia, and I’ve been getting the runaround from Chevy dealerships for the last 11,000 miles. My 2025 Suburban (5.3L L84) has a serious mechanical issue, and I’m being treated like I don’t know my own vehicle. I need your advice on how to handle this and how to escalate with GM. The "Gaslighting" Timeline: 44,000 Miles: A metallic "knock knock" sound started while in Drive or Reverse with the brake applied (especially after long 8-10 hour shifts). Took it to the dealer; they said "Everything is normal." 45,000 Miles: "Low Engine Oil" light came on. Dealer told me it's a large vehicle and "oil consumption is normal." 49,000 Miles: Went back for the noise. They told me, "If the noise is from the transmission, we don't have a transmission specialist here, go to another dealer." Same Day (Second Dealer): The noise disappeared by the time I arrived. They kept it for 2 days and said they couldn't find anything. 55,000 Miles: After 3-4 more visits, the noise finally happened in front of the Service Manager. He admitted: "Yes, this noise is NOT normal." However, the tech—who previously called it normal—now says it might be the Transmission/Torque Converter. The Diagnostic (or lack thereof): After 2 days, they gave it back saying "No issues found." I insisted on a GDS2 scan for Misfire Analysis; they showed me 0 counts and said everything is fine. The "Oil Filter" Incident: I requested the oil filter and a sample. They literally cut the filter open with a hacksaw—getting metal shavings everywhere—and handed it to me without even inspecting it for internal debris. The "Bottom End" Admission: I took the car to my previous dealer again. After another 3 days of "nothing found," one tech finally admitted the noise might be coming from the Bottom End (Main Bearings). Their solution? "Drive it for another 4,000 miles, then we’ll check again." Current Situation: I have an engine making a clear mechanical knock, dealerships that contradict each other, and a business where I’m losing $500/day while they play games. Independent shops are split between "Lifter failure" and "Torque Converter." My Questions: Has anyone seen a case where the dealer asks you to drive 4,000 more miles on a knocking engine just to "see what happens"? Is this a tactic to run out the warranty? I’m sending a sample to Blackstone Labs. If I find metal, can GM still deny a Long Block replacement by claiming the hacksaw cut contaminated the sample? Given the history since 44k miles, do I have a strong Lemon Law case in VA even if they haven't "failed" a repair yet because they refuse to attempt one? I’m tired of being treated like I’m crazy. Any advice on how to get GM Corporate involved immediately would be a lifesaver.

2025 Suburban 5.3 V8 vehicle Notice how the sound is a rhythmic, metallic knock that seems to originate from the driver-side bank. It is most prominent when the vehicle is in Gear (Drive or Reverse) with the brake applied, especially after the engine is fully warmed up from a long shift. One tech says 'Lifter', another says 'Bottom End', and another says 'Torque Converter'. I would appreciate it if you could listen and let me know if this sounds like the typical L84 lifter failure or something else.