Of course one should use steam-oil. But if you are temporarily out of it, using normal car crancase oil is ok, until you get the right stuff. Even Aster wrote so in their instructionsfor my P8 / BR38. ( I would go for mineral, but seriously, probably even cooking oil or whatever, would do.)
Aso the water has a lubricating effect. Though running a completetly new engine without oil, is a bad idea, in my opinion.
Also, running on air for any extended time, without oil, makes me uneasy. During assembly, one normally puts some oil in the cylinders, so a bit of testrunning on dry air, is ok.
Member of Stockholm Livesteamers, Sweden
Owns Märklin gasfired BR89 (sort of T3), BR18 (S3/6) and alcohol fueled Aster P8 (BR38)
Last edited by Pauli; 07-20-2020 at 09:26 AM.