Tappets and additives. Crock?

[floatingkiwi]

Gidday all fellas and fellases

Got a bit of a bad tappet rattle in the old girl (the SVX that is), I'm sure they have gotta be hydraulic, so this probably doesn't bode well for me. Any one used any "additives" successfully in this sort of situation?? Engine tool-box in can sort of things - which I always scoff at.
They are advertising something called "XR-1" here at the moment, seems that the space shuttle launcher platform uses it. Whadaya reakon, another crock??

Have any SVXérs out there used any of this sort of stuff (with good results??)

Cheers all and good driving