I have recently purchaced some new plastic fitting for my cam oiler tubes on my w107 500 sl (m117.962) and they are a rather loose fitting in camparison with the originals.

My tubes are the 10mm diamater alloy ones. I relise there are only 2 types, an 8mm version and a 10mm version, so I must have the right ones or they wouldn't go on at all

Are they supposed to shrink? If so can they deliver the right oil pressure to the cams and bearings until they do? When I removed the old ones, I had to heat them slightly with a hot air gun, so I would suggest they must expand under heat, not contract?

Any thoughts?

Regards

Damian