SierraHD17

Gm screwed up there and has only in recent times improved. For all intents their "offroad" packages are simply appearance and the small suspension changes are all available with the NHT package beyond the Rancho shocks. Oh you want a particular interior package and body color bumpers and grill... well then you can't get the better trailering group.... Just dumb lol. At least now you can get these things and option trucks like the RST trim with the NHT option.

Its encryption and honestly let's be real here... who buys these trucks mostly? Fleets. There is no care for custom tuning with fleet operators. It's like the 6 liter with the e78 ecm since 2011. Yes you can half ass tune them but it's only half ass. Ask anyone who tries to cam one or run a supercharger etc... Guys that grab L96s for a swap like to toss the e78 in the trash and go for an e38 because it has full tuning support. I can see guys that swap this 6.6 just using the e92 that the 2014 through 2018 half tons, Camaros and Corvettes use. You will likely be waiting a very long time for any real tuning for these trucks. The Ford is not really encrypted, Ford themsleves seem to be driving customization to a degree, and honestly there is a lot more fanfare for the 7.3 anyway.. hence they have tuning. Ford pushing the 7.3 out as a crate engine with ecm and harness for swap purposes really helps here lol.

Nothing.

So that was taken in May of 2016. I installed that exhaust in October of 2015 lol. No my truck didn't look like the Titanic underneath and still looked great. The factory exhaust would have held up better than this did and the head pipe of course did. I sent these photos and proof of purchase to MBRP to see what their response was. MBRP said that this level of pitting and corrosion was totally normal for their T409 systems in that time frame. Funny... I have had a Magnaflow T409 stainless exhaust on my 05 1500HD for 4 or 5 years now and it still looks nicer than this MBRP did after 8 months on my truck. You can see where i scrubbed the hell out of it with metal polish and a scothbrite and all the pitting it had. No thanks. My 2017 has stock piping (it's an HD so its 3.5") and a muffler swap.. the oem exhaust still looks more or less new after 3 years now lol. Great product MBRP lol. You get what you pay for.

Yup. I took the MBRP off my last Silverado and replaced if with a Borla ATAK... what I wanted and should have bought in the first place. I might have pictures of my old MBRP to show you how terrible it was in around 9 months time.

I have had 4 different MBRP systems and after my Silverado enough was enough. It rusts bad if you drive where they salt the roads... in less than a year I had corrosion and pitting I would expect from a 5 year old exhaust system and I live where we actually don't salt all that heavily or often because it's usually too cold for it to be effective. The black powder coating also fell off almost immediately on 3 different tips I had and one full system. Hell water running down the inner panels of the box and running across the tip took off the "powdercoat". Rustoleum paint honestly held up better than their powder coating did and I could wire wheel the powdercoat off like I was cheap paint. I will never buy anything from MBRP ever again. If I want cheap junk I will buy aluminumized pipe from an exhaust shop.

These trucks have a built in leak in the oilpan everyone overlooks. There is a pressure relief valve in the oilpan directly above the oil filter. It can get full of gack, start sticking, get weak just like anything else. When the truck is cold I guarantee your discharge pressure from the pump is probably 50 pounds at idle... that pressure relief in the pan opens fully by 55 psi so its starting to lift already in the 40 something psi range. As your engine warms up that pressure is going to drop and of course with that pressure relief leaking the observed pressure drops too. Case in point is my own truck... a 2013 6.2. I measure pump discharge pressure versus reading at the sending unit. At times I have 20 psi of differential between the two and the only thing between them other than the oil filter is that stupid valve in the oil pan. On anything without AFM I remove it, toss it in the garbage and replace it with a plug. The oil pump has it's own built in relief and this second one was added only to keep pressure below 55 psi on afm equipped engines. Since the trucks all use the same oilpan whether it has afm or not it comes with the valve. I would say in the end your pressure is okay and doesn't warrant tearing the oilpan back off again. That said I would start at that relief valve leaking too easily before the engine being worn... because with regular service at 125000 miles your bearings will probably still have a perfect untouched coating on the surface. I have pulled LS's apart with 300000+ miles and the bearings in the bottom end are still perfect.. With AFM you are supposed to leave the valve in the oilpan in place as it's there to protect the solenoids in the lifter valley and the afm lifters... If you ever pull the pan again you can replace it but otherwise unless you delete that afm rubbish I would leave it installed. Those lifters and solenoids have enough issues already so they don't needed higher than rated pressure tossed at them.

Even a brand new pump can have bypass spring issues... also coupled with the fact your first post has its doubts the guy changed out the pump. If he swapped it without removal of the pan it means full disassembly of the oil pump to install it so who knows what he did. If you are of course verifying this issue (now) still with a test gauge. Usually a spun cam bearing makes noise but not always which is why I mention it.

What year and if it's an 07... what body style? 5.3? If its the 04 you have in your profile it sounds like the bypass spring is sticking in the oil pump or you have a spun cam bearing or something allowing the pressure loss downstream. Overfilling with oil would only account for a suction leak on the o ring... if the bypass is open on the oil pump overfilling wouldn't do anything for you.

NO! Gen 3 engines (so your 99 to 07 gmt800 trucks) do not have the screen. Hook a scan tool up to your truck and see if you can read the oil pressure. If you can the sender is fine and your stepper motor is bad like every other 03 to 07 cluster out there.

Pretty much. Sometimes the high trade works in your favor and sometimes not. When I bought my 2015 Silverado I had a 2013 F150 I bought 18 months prior and paid 32k out the door for. It was a weird oddball XLT extended cab with a 6.2 in it so not a common truck. Everyone at the time was offering around 13k in rebates on a finance deal plus then whatever else you could negotiate on the GM trucks. When I mentioned trade in they would offer me about 23k for the Ford at the highest. One dealer though did better and I say that's why you watch. They offered an initial 9500 off the new truck but then offered 30k for my trade... well you do the math... still better than anyone else. I ended up having to threaten to walk when I got to the dealer with my trade in as they of course changed their minds miraculously but I got my deal in the end. It's all a numbers game... shop around asking first on an out the door price then bring up the possibility of a trade in after... you will find something.

No you are just trying to argue based on using GM's engineering which we know is under constraint based off theoretical and usually laboratory fuel economy testing.... that's a fact. It's a terrible idea for people that tow and running your fluid at the high end of the scale degrades it with time and any oil manufacturer can show you that.. that's a fact. Doesn't much matter anymore though lol.

Wrong again... direct injection is one of your leading achievements... lol. You keep believing you need that thermostat... but if you don't tow or do anything but just commute it won't really matter.. as much.

About as significant as running 5w30 oil versus 0w20 lol... negligible. As mentioned your tube pass in the radiator tank acts as a heater anyway with any fluid temp below the cooling system temp.