Loud noise on cold start up.Almost sounds like a diesel.
Any service techs on here?
Sounds like lifters,or is piston slap that bad? Approximately 90,000 miles.
Probably piston slap. A buddy used Lucas Oil engine oil stabilizer with every oil change and it fixed the problem. Worth a try
Make sure you use only 5W30 full synthetic oil.
My preference is Valvoline Synpower, about $24 for a 5 Qt jug at WallyWorld. My 6.0 rattled like crazy on cold start when I bought it at 97,000 miles, and that change alone completely quieted it down. 281K on it now, still purrs like a kitten.
(Note: Do NOT use the High-Mileage oils made by ANYONE. They do nothing "extra" for any engine, and WILL stain concrete, even when it is fresh from the bottle).
Dan "Jim" Moore
Much too young to feel this damn old!!
I took my truck to the dealer.Now they want to keep it another day or so.
They heard the noise,and are thinking that I may have a bad lifter that has been a problem from having the Active Fuel Management System.
I have used Valvoline 5W30 Synpower from day one.
I’ll check on Tuesday but I think that truck takes 0-20 oil.
I HAVE A 2011 6.2 AND IT CALLS FOR 5W30.
STATE CAPITOL RACEWAY
2017 QUICK-16 TRACK CHAMPION
I currently have a 14 (90k miles) and a 17 (9k) miles with 6.2's...both take 0W-20. BOTH are loud and blue smoke slightly on cold start up. BOTH also "clunk" shifting from park to reverse. And "clunk" the driveline coming to a stop often.
I am still trying to figure out how they came up with the outta control pricing from the factory...thet may look different on the inside and out, but still behave the same way they did 20 yrs ago! Still feel ripped off at times.
Even if it is 5-30 both seem awfully thin for what that vehicle is asked to do. I've always surmised, right or wrong, that the mfgs. keep the hot number low to enhance mileage and help meet govt. mandates. I never run anything lower than a 30 in any of my daily vehicles and generally 40.
Illegitimi non carborundum
CV, wrong weight oil will cause this problem
In 2013,my owner's manual says 5w-30.So does the oil cap.
The dealer was nice enough to loan me a new Chevy Trax.
I never knew the heads have to come off in order to change the lifters.Seems crazy.This might take awhile to get back.
I know you all are talking about newer trucks, but my 2000 had piston slap at 30,000 dealer and GM told me it was not a problem. At 217,000 I pulled the motor it had one piston with .008" piston to wall and one with .007" all the rest were with in spec. No oil or additive was going to quite that down, polished the crank, honed the block, new pistons, and reworked the heads and it has another 50,000 on it now.
Duck, I get it but can only tell you what happened. What would it hurt to give it a try
Too many things in newer motors that operate on the oil pressure to fool around with thicker oil. Between the Active Fuel Management lifters, some use hydraulic timing chain tensioners and we've all heard of the Ford diesels that ran poorly because they were low on oil, used the wrong oil or neglected to change the oil.
LS motors tend to use oil, there's GM bulletins about it and also have piston slap and lifter noise.
Mine did quite down after it warmed up guessing the piston expanded with heat.
The wrong weight oil can make a huge difference in the amount of noise from piston slap.
Years ago, in dead of summer, I put 10W30 in mine, instead of the 5W30. Same brand, and synthetic. It sounded like hell on startup, even at 100* ambient temp.
Couldn't stand it, a week later I changed it to the 5W30, and it quieted right back down.
What didn't make sense to me, was I figured the heavier oil would provide a thicker "cushion" between piston and cylinder wall, and make it quieter. Exactly the opposite was true. Maybe the thinner stuff gets thrown up into the bores more than the thicker oil?
I do know there is no reason to run heavy oil in these newer engines. With the factory oil coolers, they do just fine. Mine has pulled the 10,000 # trailer for thousands of miles, up and down hills, mountains, and at high speed in 100*+ heat for hours on end, and still has the same power and oil pressure that it did when I bought it.
Dan "Jim" Moore
Much too young to feel this damn old!!
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I have heard it said that carbon building on top of the piston affects the rock of the piston, and can make the slap noise much worse. I have done a decarbon with Seafoam, and it made a significant difference. But the improvement was pretty temporary.
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I read somewhere one time that you shouldn't run heavier weight oil in the newer stuff because it slows the oil getting to everywhere it needs to be at start up. The clearances on the new stuff is so close they don't need really heavy oil anyway.
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I stand corrected, 5-30 is the correct oil. Just a heads up, gm recommends their dexos which is synthetic oil.
Quick update on my truck.I have had it back for about a week.It runs and sounds like a new truck.
New lifters made a world of difference.
If you are still within a Powertrain Warranty,I think it is worth it to have your truck looked at.
They shouldn't be making obnoxious sounds that some call "piston slap" and others call "a little lifter noise".
I have tried all different viscosities of oils as well as brands, always synthetic since day one on my 2001 6 liter. Some oils were bad, really bad. I put Royal Purple in it once and drained it the next day and used it in my S15 pickup, that stuff was horrendous in there!
I run Mobil1 10W/30 in it all the time after the first year of experimenting. Truck has 140K or so on it and still runs perfect.
Just couldn't do the 5 weight thing.....
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