No it's not a trick question. I was just hoping that you had no unachievable goals in mind, like a motor overhaul in a can.

So here's my response: Today's motor oils are a marvel of chemistry. Even the worst of todays premium motor oils are a blend of oil stock and additives that are LIGHT YEARS beyond the motor oil that was available when your car was new. In fact, todays motor oils consist of a delicate balance of additives that are carefully formulated at great expense to their producers. Adding additives to such a delicate balance is risky at best. In some cases it will make the oil much less effective due to the imbalance of the careful formulation.

The good news is that using the proper, modern oil in your engine gives it WAY better lubrication than anything that could have been purchased and poured in the crank case when the car was new. Further good news is that the additives are ALREADY IN THERE!

In the case of your car, there is one area of most modern oils that falls short for use in your older engine. Todays engines all have roller cam followers. Your engine and all those in its day had sliding cam followers that required a zinc additive as a sacrificial metal for cam and cam follower life.

Off the shelf oils today, even most of the synthetic oils do NOT contain this additive. Your best bet is to use one of the oils that the truckers use. These oils have this additive PLUS they have added detergents for keeping the crank case clean. My favorite is Chevron Delo, but Mobil Delvac and Shell Rotella T are also excellent choices for your application.

If you will use one of these oils and change it frequently, you will be doing your engine a MUCH better favor than risking formulation imbalance with an aftermarket additive.

Best of luck,