Aside from replacing the occasional crank case ventilation valve with some success, after giving the customer the choice of buying more oil compared to spending thousands venturing into the unknown, I haven't done much else. I haven't been taking on anymore new customers that own these in an attempt to phase out working on them all together. After customers spend thousands on cooler seals, intake manifolds, timing chains, turbos, etc, it seems that in some way or another you end up being married to the car. I find that life is much better when just working on their gas counter parts.