Gonzo42 wrote:
Back in the 60's, I used to be able to buy reclaimed oil at my local market.
Since it was so cheap, I did the following: drain the old oil and fill up with the reclaimed oil. Then I drove for about 1/2 hour until the engine reached full operating temperature. At that point I changed the filter, drained the reclaimed oil, then filled with fresh new oil.
IMHO, my engines lasted a long time. Now I have my first diesel, made by M-B and they have a very restricted list of approved oils. In addition to that, I noticed that the fresh oil turned black in only about 5 minutes after changing the oil.
So I ask whether doing the above procedure would provide any benefit or is it just a waste of time and money?
It's a waste of time IMO. Diesel oil turns black after a few minutes; this is normal. Use the MB approved oils and don't over-think it.