hello newbie here.I just purchased an 08 lmm 2 days ago i sold my 01 dmax and used fuel additive reguarly.i asked the dealer if i used fuel additive in the lmm would it void the warranty.she never answered yes or no but she did say that i dont need it.i live in northern jersey and we can see 0 degress around here. does anyone use fuel additive in there lmm for anti gelling reasons or for any other reason if so what kind ?