ANYONE claiming that their warranties can't be voided due to aftermarket parts, that the buyer has Magnussen-Moss protection, etc. , etc, is TECHNICALLY correct...
AS LONG AS the unfortunate BUYER has DEEP pockets, and is willing to gamble VAST sums of money and TIME to actively pursue legal action thru the courts...
MOST of us DON'T! And rest assured that outfits like Amsoil have lawyers on retainer to challenge yer claims JUST THESAME as DC, Ford and GM do!
SO, *WHY* gamble substantial money, time and endless frustration over various warranty endangering trinkets and various "engine salvation" chemicals and such, for so MINIMAL a potential return?
Use name brand, manufacturer recmmended lubricants, service yer truck at recommended intervals, and apply go-fast goodies strictly at yer OWN risk - cuz 999 times out of a thousand, it will be YOU on the short end of the "warranty stick", and Magnussen-moss and yer "outhouse warranty lawyers" ain't gonna do ya a DERN BIT of good!
COUNT ON IT!