I've really been enjoying reading all of your posts on oil, and appreciate all of the knowledge you have on synthetics, and taking the time to share it with us. Keep up the good work.
What brand of synthetic do you plan on using next?
My father always used Amsoil. His 1981 380 SE went just shy of 400,000 miles when he passed away, and he always changed his oil every 3,000 miles or 3 months, whichever came first.
The only problem is, it's hard to get. Not available retail.
If I recall, he became an authorized dealer, and ordered it in bulk for himself, friends, and family.
Fwiw, my dad also worked for an oil company his whole life (Unocal), and knew quite a bit about oil. And when the synthetics came out, he was a biiiig convert.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".