it says right on the bottle. I dont know off hand but the duratec calls for just about 6.5 (i used to use 6, thanks again CEG) quarts of oil. So, I put in about just under 5 and a half and the just about a quart of the lucas oil. THE STUFF IS AMAZING! You can truly feel the differece. Plus, it basically eliminates dry starts, makes your oil last longer, lubricates much much better. And, I get 20% off the stuff through my work. Along, with anything else i want!
