I found this online... I think the article was dated 2006. I don't even know if they make this anymore.
"Oil additives like the Fram Oil Treatment and Stabilizer are especially useful to people who drive a lot of kilometers annually, or use their vehicle regularly for hauling or towing," said Megan Currie, the Fram brand product manager. "What we call 'heavy duty cycle use,' or just hard use, can deplete the protective qualities in engine oils fast. Our oil stabilizer provides additives that give engines protection; it's like giving your engine oil vitamins."
Fram produces two oil additives - Fram Oil Treatment and Stabilizer and Fram Synthetic Oil Treatment and Stabilizer - designed to protect the engine between oil changes and safeguard it during the most demanding of driving situations.
These products fight oil breakdown, rust and corrosion. The treatments' detergents keep the engine running cleaner and at its most efficient, and its conditioners protect seals from potential leaks.
Use is easy; simply substitute the Fram Oil Treatment and Stabilizer for one quart of oil during a regular oil change. For more information, visit www.fram.com.