Originally Posted by torsionbar

Rather than internet hearsay, you can get the data you're after for very little cost. Look up blackstone-labs.com They do oil analysis, you send them in a sample, they email you a result showing you exactly what is or isn't in the oil. Its inexpensive for this service. The typical use case for such an analysis is used oil from your engine, to help tune your oil change interval and also assess the health of your engine. But you can also send them a sample of brand new oil, and then you'll find out precisely how much zinc and other additives the oil contains.

Personally, I use Liqui Moly Leichtlauf High Tech 5w40 in all my diesels. It's formulated specifically for older diesels (i.e. without particulate filter) and has the full ZDDP package. It also carries MB 229.5 certification. I order mine from id parts dot com for around $36 for a 5 liter.