Ok looking for your opinion on break in oil!!!!!!!!!!!!!

[1st_charger]

I know this has probably been beaten to death but I'm getting ready to start a newly rebuilt 67 hp 440 and am interested to know what you all perfer to use as your break in oil and reason why!  Examples: It has this this and this in it, its made here(USA) , or even this is what I have used for years and it works! so lets here! O and right now I'm leaning towards Brad Penn!

[Fred]

I used the below mentioned product to break in my hemi.......................

BRAD PENN® PENN-GRADE 1®
Break-In Oil

SAE 30 mono-grade oil formulated specifically to meet the critical lubrication needs of new engines during break-in while allowing proper seating of rings and component 'run-in'.  Enhanced levels of "zinc" (zinc dialkyldithiophosphate a.k.a. ZDDP) and superior oil film strength from Penn Grade™ base oils offer complete anti-wear, anti-scuffing protection for even the most demanding of applications such as those presented by break-in of engines with 'flat tappet' cams.

Now I'm using  PENN-GRADE 1®........ 20W-50

[justcruisin]

I used Lucas breakin oil on my rebuild, it's a mono 30 dino and is loaded with zinc/ phos. Changed it after breakin and refilled with the same. Running it for the first 500 miles. No problems, rings seem to have seated well, 180psi as per spec.

[Cooter]

No matter which "Break-in" oil you use, make sure it's at least 1800-2000 PPM(Parts Per Million) of Zinc/Phospherous.

FWIW, I run "Spectro" brand racing oil. Remember, break in is great, but you will need to run the good oil for the life that 440.

[firefighter3931]

Brad Penn 



Ron

[1st_charger]

thanks for the replies every one looks like I'm going to go with Brad Penn and recommend that the engine use it for its life time.