I like the extra strength features of the high mileage motor oils, ATFs, etc. But the one thing I do not like is the "seal conditioners". And I'm refusing to use them just because of that. My understanding is that the seal conditioners soften the seals to make them prevent leaks better. Well, that is great if you have a leak, but I don't. Anything that "softens the seals" sounds like it is chemically attacking them in some way. And I can't help wondering if this will eventually degrade the seals to the point that they will leak... especially if I wanted to return to a standard fluid rather than a high-mileage one. Am I completely guessing wrong on how these seal conditioners actually operate?