The dreaded lifter noise on the 119 engines seems to be more common as these engines exceed 100,000 miles. I have not found definite answers to the following questions in all of the 119 engine oil tube discussions.

1. Are the metal oil tubes that apparently were installed originally in pre 1994 119 engines still available from Mercedes?

2. If available, can the metal oil tubes be used as a replacement for the plastic oil tubes used in later 119 engines?

It sounds like the metal tubes are superior if they can be used.

Thanks!