About stephensservice

tochwat@gmail.com - Tad Ochwat (This is the person that helped us set up the account. He still has authority to log in and do whatever he may need to do. He has gotten out of the business & we don't see him as often as we did. If we get in trouble, he is still OK to fix things. The site is owned by Tom Stephens, cell 916.715.0665)

Mercedes-Benz Sprinter OM642 & OM651 BlueTec Diesel Issues & Problems

Jan. 14, 2021 — I would like to start with saying the following comments are my own opinions.  After 50 years working with and for Mercedes-Benz as a Mechanic, Shop Foreman, Instructor, Service Manager and Shop Owner I retired in 2018.  I no longer have any affiliation with Mercedes-Benz or its authorized […]

BlueTec Diesel Oil

I need to rewrite this article about BlueTec diesel oil.  I get so many calls about what’s the best oil, that I haven’t had time.  I normally have to think about what I’ll say, because everybody and their Mother gets twisted.  For the moment, I’ll be blunt.  Mercedes is using a Gasoline engine oil […]

Breaking-in a new BlueTec diesel

Diesel Particulate Filter and the DPF Monitor operation

DPF operation parameters / 2019 and 2020

In 2019 Mercedes-Benz installed a DPF monitor in the Instrument Cluster.  It’s a symbol that looks like a muffler with dots in it.  It displays the percentage of soot in the DPF.  When the DPF is filled with 100% of soot, the engine computer starts the automatic regeneration […]

Battery Advice

If you have a dead battery, you’ll want to use a genuine Mercedes-Benz battery. Aftermarket batteries don’t have enough amperage and cause low voltage fault codes when the system is under peak loads. Low voltage confuses the control modules and causes a host of problems that just end up costing you far more then you could ever […]

When did you first learn the value of a good mechanic?