So I finally have my new engine installed ( bone stock rotating assembly except I did put a tow cam in it) and im looking at engine break in procedures they all recommend towing decent weight no idle time ect all makes sense but I have 2 questions

1 ) should I run higher timing with the quadzilla to try and raise cylinder pressure for better ring seal?

2) highly contrivosal but does anyone recommend a break in oil if so what type? Ill be switching to Synthetic after the first 1000 miles and changing oil after the first 400-500 miles ( block has been sitting for years so lots of dirt and such probably in it)

From what I understand regarding engine break-in for Cummins, is to operate the engine at various engine rpm's and various engine loads for a specified number miles (not sure about the miles ), and to not use synthetic oil during the break-in period. What Cummins does not want is a steady engine rpm and a steady engine load.

Not sure about the use of break-in oil.

• John

Yup cummins just called for conventional 15w 40 too nothing special. And I can get alot of conventional 15w 40 for the price of x1 round of break in oil. Cummins i trust to say what their engine needs and dont need mopar/dodge I'll take with a grain of salt