thanks, i just might try the auto-rx. the other products are mainly flushing solvent / detergent types which you add just prior to draining. the lubegard product is used in some power flushing treatments and they say it's harmless to seals. i think i'd rather use something that works over a few hundred miles rather than in 15 minutes although this reasoning may be flawed...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"