Dear Bob,
Short answer, yes, but this is true for all engines. Slightly longer answer, diesel engines in general, and Deutz engines in particular, are built like tanks, and 30 minutes is more than long enough to get the oil warm, and the engine stabilized. Deutz engines have extra oil passages around the base of each cylinder to help warm it up, and keep the dimensions stable as the engine goes from cold to warm. So, the engine design is trying to help. (It also reduces emissions and noise.)
That said, an engine will last the longest under constant load (less than 80%), at constant temperature, with a single weight oil, changed regularly. In an ideal world, there would be a clutch between the engine and the hydraulic pumps, so the engine could start without a load on it.
Startup causes (relatively speaking) a lot of wear, since the oil is not yet pumped up into the engine's upper reaches. The vertical location of the Deutz filters helps retain all of the oil in the filter, but the upper galleries can still lose oil. You can install
accumulators that will pre-pressurize the oil system, if you are really concerned. There are also additives that help with this, but you may notice that UPS and FedEx don't use either of them and get lots of miles on their trucks. You want the engine to get warm enough to drive out any water that may have condensed in the oil.
(Recently, I noticed changing my oil that the Deutz oil filter had a little rust on the spring inside the oil filter. I've never used a pressure washer on the engine. Hmmm.)
I never move my PT until after the oil pressure has come up and stabilized, and until the oil is warm, I never run the engine speed way up. I like my PT, and I want to have it around for a long time.
But for thirty minutes, I wouldn't even consider worrying about it. If I was considering using the PT only for 2 minutes at a time, I would accelerate the oil change.
I hope that this helps.
All the best,
Peter