Joe Gibbs "BR" Break-In Oil.  
Product Features:

Used by Joe Gibbs Racing to break-in and dyno all their engines.
Petroleum oil formula provides the
highest levels of
Zinc and Phosphorus for flat-tappet engines.
Promotes ring seal and provides maximum protection available
for cams and lifters during initial break-in.
Good for dyno use.
Requires no additional additives.
Provides maximum compression and generates maximum horsepower.
Compatible with methanol and high-octane race fuels.

Is This The Right Oil For My Application?
Specifically designed for breaking in engines and flat tappet camshafts and lifters, BR break-in oil provides high levels of Zinc, Phosphorus and Sulfur in a mineral base oil. BR protects flat-tappet camshafts and lifters during break-in and it provides excellent ring seal. BR provides the highest levels of protection for camshafts, lifters, wrist pins, distributor gears, push rods and valve retainers. BR is fully formulated and requires no EOS or other additives. BR should be pre-heated to 180F before firing the engine for maximum protection. Because it is a 15W-50, BR can be used for hours of break-in/dyno time before changing to std oil.

We like to add 1 quart of Joe Gibbs BR oil to Castrol 20/50 for all of our new motors during brake-in.

Available In:
1Quart
$6.99 each
Case of 12 Quarts
$79.99

Other Joe Gibbs oils available!

Some good oil 101 info!!!!

http://www.joegibbsracingoil.com/Downloads/racingoil101.pdf

Joe Gibbs BR Oil