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ATP Automotive AT-205 Re-Seal
Full 8oz bottle will treat a 6qt capacity with maximum effectiveness. Adjust usage based on capacity.
I usually put about half in engine oil, 1/8 - 1/16 in power steering, and the rest in transmission. I don't go exact measurement. 8oz per 6qt is maximum effectiveness and you should see results with these ratios. You can add more if you feel you want to make it exact measurements. Capacity of engine oil is roughly 4.5 quarts. Power steering is roughly 1.2 quarts, and transmission is roughly 8-9 quarts. When you drain/refill I would add 1 bottle to last drain/refill, but just adding in you don't want to add too much extra liquid and overfill. Transmission seals are less likely to leak, but do leak, just less likely, so not as important as engine and power steering.
Interval I like to Add once per year with my engine oil. I chance engine oil every Sept. and March 2 times per year. Regardless of miles. I change transmission fluid once every year after initial 3 x Drain/refill once I get my vehicles new. Compared to the 3X drain/refill interval. I add half and half each year. Power steering I change every 3 years along with brake and VTM-4, but I don't use them in those systems. If I ever get a VTM-4 leak which hasn't happened I would put it in there before replacing any seals, but never had an issue, so I'm not going to worry about it. I still only do 1/8 bottle in power steering with fresh fluid through entire system. Coolant I drain/fill radiator every 3 years, and drain the block and all old coolant when I get new to me.
Basically when I get the vehicle new to me, I go through and replace the fluids all fresh so I know they are the correct type, and gives me an idea of the health of the vehicle.