I've seen lot of people on here rave about wynns products and I've also used them on a low (ish(64k)) mileage v6, that had seemingly done that whole mileage on one oil change, to satisfactory results. Lifter treatment and a engine flush bit long after quietned it down a treat and got all the crappy oil sludge out, also have always sworn by the occasional bottle of fuel treatment, my td's got it on every other fuel filter change

Another thing that might be worth considering, is Slick 50.. I've always been against the stuff until recently, I put some in my 1.3 cdti and it quietned it down and I haven't seen any blue smoke out the exhaust since (it would smoke from cold if parked on a slope facing upward by the right angle and now doesn't) and I SWEAR my fuel tank gives me about 30 miles more since doing so, I also haven't blown it up yet as a result. something you might want to look into???