I recently bought my dad a 95 lesabre with 51k miles on it. The engine seems to run great but I'm really not sure how well it has been taken care of in the past. I have run a bottle of autorx in it for 2.5k miles and dino for another 3k miles. It does have a very leak somewhere. I'm really tempted to run PP to really clean up the engine but really afraid of worsening the leak. On the other hand, maxlife maybe a great option in this case. What do you guys think?