5.0L V8 Technical DiscussionsAny questions about the 'Coyote' engine, transmission, exhaust, tuners/CAI, or gearing can be asked here!
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I bought my gt new three years ago and have changed the oil with mobil1 5w-20 four times. It has 31,000 miles on it now. I don't think I drive it hard, and I baby it when its cold. When it is cold or has been sitting for a few hours, if I start it and drive it the first couple of miles, it has a engine clatter that starts at 2400 rpms and above, when the accelerator is feathered. It will make the noise sitting still in neutral. It quits after the first couple if miles, or I just can't hear it. I took it to my friendly Carolina Ford dealer I bought it from. They admitted they heard the noise, and put it down as a bottom end noise. They kept it two weeks and the service write-up says they checked the oil, had it analyzed for metal, removed the serpentine belts to check for accessory noise, and performed two TSBs on it for engine noises. They said they talked to Ford about it, and Ford said it is a "normal operational noise". I asked what is it - piston slap, valve clatter, timing chain rattle or what and they would only repeat "normal operational noise". They said they checked a car just like it and got it to do it too, so they say they all do it. They said a new F150 will do it. Anybody out there have the same thing? Thanks.
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Weird that the dealer calls it bottom end noise... I hear a bit of valve chatter at idle on very cold days, I just chalk it up to oil seepage. I just keep it under 3k until the oil temp reaches normal, then under 4k until it reaches the mid way point. 22,000 miles, no issue.
Not trying to rekindle an old debate here, but I did follow a fairly rigorous break-in procedure that's worked well for me on past new cars (didn't break 4k for the first 1,000 miles), but am not sure that it has any effect.
I wasn't sure about the bottom end call, either. I've heard broken piston noises before and it doesn't sound like that kind of knock. It sounds like valves with way too much lash, but odd that it only does it when I feather the gas. They said they were going to check the oil filter for metal and take the oil pan off for a look, but then they did neither. (Our local Carolina Ford service writers are experts at doing nothing, and they have an answer for everything. They first tried the old oil filter check valve routine). It doesn't sound like an expensive noise, and now I just keep it under 2000 rpm for a little bit. Much thanks, y'all.
Next time I change oil, I think I'll go to 10W-30 or above. The shop supervisor at the Ford store said the recommendation now for Coyotes is 5W-50 (???).
The track pack cars call for 5w-50 while the non track pack cars call for 5w-20. But they have the same engine. This is where the shop supervisor must have gotten confused. I use Amsoil 10w-30 as well as many others with no issues. UOA reports come back excellent with that oil.
2011 Mustang GT Automatic 401A Premium
Boss Intake, Circle D 4C converter, American Racing 1 7/8 Longtubes and off road x-pipe, Kooks catback, BMR lowering springs, BMR lower control arms, BMR control arm relocation brackets, BMR adjustable panhard bar, Self Tuned
2003 Mach1 718 rwhp 735 rwtq @ 25 lbs. SOLD
2.3 polished Whipple and every other mod possible
Good info, everyone. I feel better about it now. Great forum. I don't hear the noise anymore, because I have made a habit of short-shifting and keeping it under 2000 rpm the first couple of miles. Kind of like having to adjust my start-off in my wife's '13 Focus to suit the DC automatic transmission. The dealer said "they all do that", too, like the Focus skating windshield wiper, but that's another story on the Focus forum.
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