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my 6.0 with 230xxx has low oil pressure but no knocks maybe a little tick though. When i bought the truck it had maybe 5-9psi cold dropping to 0 warm. Thought it may have been a pickup tube oring or oil pump so i went ahead and replaced the pickup tube, o ring, and pump. it now gets 20 cold 7 warm at idle and 0 warm at idle and 20 warm running 1700 rpm. Which is a lot better but still a problem. I am aware the bearings may be shot and need a total rebuild, that is not out of the options. It is not electrical or sensor based issue same psi with a mechanical gauge. However I need to replace my harmonic balancer and take off the timing cover again so i was looking at it and could it be as simple as a o camshaft retainer plate? it has a build in thin o ring which if fails will drain pressure as it connects the oil gallys. Am I correct in thinking that this could solve my issues? Any input is helpful, thanks.

Well, here it is: N182202780 - Special Coverage Adjustment - Brake Assist Decreased Due to Vacuum Loss GLOBAL SAFETY FIELD INVESTIGATIONS DCS5013 URGENT - DISTRIBUTE IMMEDIATELY Date: April 10, 2019 Subject: N182202780 - Special Coverage Brake Assist Decreased due to Vacuum Loss Models: 2014 – 2017 Cadillac Escalade, Escalade ESV 2014 – 2017 Chevrolet Silverado, Suburban, Tahoe 2014 – 2017 GMC Sierra, Yukon, Yukon XL To: All General Motors Dealers General Motors is releasing Special Coverage N182202780 today. The total number of U.S. vehicles involved is approximately 3,357,584. Please see the attached bulletin for details. This special coverage covers the condition described above for a period of 6 years or 72,000 miles (116,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after April 10, 2019 for US, (April 11, 2019 for Canada), are covered by this special coverage and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to April 10, 2019 for US, (April 11, 2019 for Canada), must be submitted to the Service Contract provider. Vehicle owners or lessees who paid for repairs referenced in this Special Coverage (“Customers”) are eligible for reimbursement of their reasonable and customary expenses in accordance with the procedures specified below.