I've been using Opti-Lube XPD year round in my 2.5 NAD at 1/2 oz/g. My pump has also started to leak but the engine still runs great. I've found a brand new OEM pump in England for less than $600 which is about half of a Lucas recon from the same place plus I won't have a core charge to deal with. RDS has a brand new pump for 1275.00 which is not too bad all said and done.
Jim