Great thread man!! I just recently saw it and have been reading through it all. I have a few questions for you on my rebuilt and new 396 BB which is in my 68 Camaro that I need to do a break-in within the next couple days...
The motor is a mild street type 396 BB motor with a New Comp Cams 268 Xtreme Energy Camshaft. The motor shop that rebuilt the motor recommends to use the Chevron Delo 15/40 Diesel oil to break-in the engine.
However, over the last few days, I have talked to about 3 different Comp Cams tech guys and they all had a different opinion on what to run...
The very First Comp Cam Tech told me to run the Shell Rotela T oil in a 15/40weight for the break-in with either the GM EOS or the Comp Cams Part # 159 oil additive.
The 2nd Comp Cam Tech I spoke to said to run the Valvloine VR1 in a Straight 50 weight oil for break in since it has the ZDDP additive. This second tech told me that the Valvoline VR1 oil instead of the Delo Diesel oil said that the Delo oil no longer has the anit-wear additives that it used to as of March, of 07. He told me that it was removed due to the new stricter emmissions diesel laws. The same tech also recommened running the Valvoilne VR1 20/50 oil for normal driving after the motor has been fully broken in. He also agreed on the GM EOS or Comp Oil additive # 159.
One of my questions is if a VR1 in a 50 weight is too thick for a motor break-in?
The last Comp Cam tech said to run the Chevron Delo Diesel oil in a 15/40 weight just as what my engine builder said with the EOS or Comp # 159...
As far as the oil filter, the motor came with a NAPA filter that the shop had already installed. Do you think that filter will work well for a proper break-in? Or do you recommend a different type of filter? The NAPA filter is a long style, not sure if it makes a difference between the longer or shorter stlye oil filters?
With all the different opinions about weight and brand from the Comp Cams Tech guys, Im in need of some help from guys like you who have much more experience.
After hearing my story, what would you recommend for me to do?