Autozone should change the name of their "DuraLast" products to "QuicklyGone".
I went thru this with an American car about 15 yrs. ago. I forget how many times I pulled the thing off and went back for another.
Autozone's price is appealing; their quality is a whole 'nuther thing.
Bite the bullet and get a Bosch reman for your MB or a brand new one. Anything will be better than the crap Autozone sells.
My 2 cents.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.