I have a 2004 daully with 132000 on it and i would like to put 15-40 amsoil in it but I am not sure if the truck was run before me on syn. if I put amsoil in it will it cause all the seals to leak. this truck is in like new condition.

thanks

 

no will not leak you can change from dyno to synthetic without a problem

 

thanks rotella 15-40 is in the truck now. just don't want to make any costly mistakes.

 

if you have 132000 on it now with rotella y change?