have owned since new with very little problems, small oil leak dealer replaced turbo seal, Oil leak gets much worse in next few days-turbo has to be removed to find leak-told by dealer it is the oil cooler leaking severely-costs 2k-yikes--nay suggestions-did not plan on giving up ML as had many deisels over the yeatrs that have went well into the 200's on miles....is this a sign to let it go?