MaxLife stopped leaks in the Subaru and the Saab, my driveway is now clean after many many OCI's of other stuff, from dino to synthetic. At only $14 per jug and I can run it a long time, it's worth it to me to not have to "worry" about it (Saab is a "sludger" and the Subaru has the dreaded head gasket weep). YMMV.