I have had two UOA done by Blackstone on my Suburban and wanted to hear what you guys think about the results. Let me start by giving you the details. Truck is a 2008 Chevy Suburban 1500 2wd with the 5.3L LMG (flex fuel) engine with 4L60E (4 speed) transmission and 3:73 gears. I have it custom tuned for 89 octane fuel. 245k miles. This whole thing got started when I was an over the road truck driver and I was away from home for long periods of time. I don't like/trust oil change places and I have always done my own maintenance. I ended up installing a dual remote mount oil filter setup and running over size oil filters and an aftermarket oil cooler. The 2 oversized filters are equivalent volume to 4.5 of the factory size oil filter. I run Mobil 1 extended performance (15k mile) oil and 2 Mobil 1 extended performance oil filters. I usually run 13k - 15k mile OCIs. As you can see Blackstone says the lead is high. I know under normal circumstances this could indicate bearing wear/failure. I have trouble believing that this is the case as I have no noises from the engine. Oil pressure is fantastic, I replaced the oil pump, timing chain, etc. as preventative maintenance at about 185k miles. I do suspect that perhaps the cheap Chinese aftermarket engine oil cooler I bought may be leaching lead into the oil system. Any thoughts on that??? Other than that the lab reports seem pretty good to me for running such long intervals. Interested to here what the experts here have to say. Now for the reports... there are 2 in the picture... I just sent them the 6k mile sample they requested today. I will report the findings when I get them back. Do you think the aftermarket cooler could be leaching lead from the solder it was manufactured with and if so do you think it would eventually stop doing that or not? I also run crimped hydraulic lines for all of the hoses between the engine and remote mount filter housing and cooler.
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