Uh, oh...... oil in coolant.

[arb]

You can get the same results from a generic box of baking soda as the Arm & Hammer product is essentially Sodium carbonate. This is a "Base" - they chemically convert oil into soap. Good stuff.

http://householdproducts.nlm.nih.gov/cgi-bin/household/brands?tbl=brands&id=3005022