not if they run gas engines,im still trying to find the sparkplugs in my new cummins
Back in 1984 I think it was when I was rebuilding DD's for the local transit authority, a prototype bus broke down while going through town. We were called to go get it. It wouldn't build air, so we had to tow it back.
We opened the rear hatch and there sat a transverse mounted inline Cummins 8 cylinder diesel engine with 16 spark plugs, 2 per cylinder. The head was enormous as was the coil pack mounted on the side of the block. The engineers with the bus wouldn't tell us anything about the engine or allow any pics of it.
They fixed the problem and left. Never heard anything more about the engine or what they were up to.