Re: 156 facelift 1.9JTDm engines
The JTDm engine is effectively the same as the JTD 16v m-jet but with revisions to the injectors, which reduce emission (meets Euro IV) and cut fuel consumption. They never put it in the 156 as a "JTDm", but they put it in the 147, 159 and GT as a JTDm. All JTD 16valves have 6 speeds, whether in 147, 156, 159, or GTs. The 156 did get both 140 and 150 JTD m-jet engines. If some-one told you it was a 140 and it had 5 speeds they were telling you porkies or it was a 5-cylinder mark 1!
I nearly bid for a "16 valve JTD" 147 on ebay. I phoned the bloke and he was certain it was a 16 valve, he got all shirty when I asked him if I was sure it was a 16 valve-"I drive 'em all the time mate, I know what I m talkin about" he said...I checked with the DVLA and it was an 8-valve!