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Thread Owner
Just wondering if anyone has experienced any upper cylinder lack of lubrication issues with their L5P 6.6L Duramax engines? See Bulletins 26-NA-251 and PIP-6131. I was supposed to go pick up a new 2026 Silverado 2500 HD ZR2 today but after discovering these bulletins last night I am too skeptical to go through with the deal! Back to square one! Doesn't matter anymore if the beast will be too tall for the garage anymore with these potential issues.







