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Im willing to bet its fine , guys here have complained about lights on , on the dash and strange things happening only to find once they cycled the ignition off and on again the issue was resolved .... GREMLINS !

I too have been noticing some erratic but mild rpm // on the gas // off the gas quirkiness . My buddy is a Ford Master Tech , he said the 5.2 motors have inherent "minds of their own" and has trouble shot these symptoms before generally with no real issue found . He told me to quit worrying...

Just DO NOT TUNE IT , that will result in instantaneous warranty refusal by FORD . The bolt on power adders are often not frowned upon , "not often" ....

Good Luck !

SSM 45938 - 2015-2017 Mustang Driveline Vibration At Highway Speeds Some 2015-2017 Mustang vehicles may experience a driveline vibration directly related to a vehicle speed of 70-100Kmh (50-70Mph) and is perceived as a tremor in the floor pan, seat track, or steering wheel and may be heard as a...

There is a TSB for drive line vibration in the GT350's , Give me a minute looking now .....

I work for a Ford dealership , you tune a Voodoo and your warranty is done , NO Exceptions . Ford is very strict on the Voodoo engines due to the massive cost of a replacement , Ford does not fix these motors , if its warranty , you get a new one . I have seen grown men cry in the service...

I try to keep mine between the upper hash line and the top hole .... It is a dangerous proposition to let these motors run low on oil .

Just saw this , I can do this too if anyone else is interested .....

Good answer .

I Sell Ford parts wholesale , one of my buddies here did the update for me . Nothing noticeable has changed .... I have been looking into a new GT350 , but what if that one had the same issue ???

I have the piston slap too , I cant stand it , no real oil consumption or any other problems though ....

Well , I guess I'm going to have to live with it , It is reassuring that its common and I'm not the only one afflicted . It is aggravating , I didnt really panic about it until I read some posts of a few yahoos saying it was going to cut motor life short , which conflicts what Ford said as it...

Mine is loud when cold , better when warm , but still audible .

From 1900 rpm to about 3200 when light on the gas , mine is always there also but is exacerbated when cold . so aggravating and unnerving ...

Yes , he said it was typical for this motor . I do not know how many he has heard , but to me its pretty loud . I guess I have to see if it gets any louder over time .... Its so aggravating , sounds like a crap can , especially when cold ....

I have a 2016 GT 350 I bought used with 15,500 miles on it now , it is a beautiful car but has recently been diagnosed with the piston slap issue . A TSB that doesn't specifically pertain to my VIN # states its normal and will not decrease the longevity of the motor . I did a lot of...

My 2016 GT350 with 15,500 mi. was just diagnosed at the dealer to have the piston slap issue , and it sounds just like the video you posted . Ford says its normal , even though my car sounds like a "Shitbox" . Not sure if I can live with it or not .... Still researching .