Originally Posted By: RogerBacon
I just purchased a 2010 Class 7 with a Blue Tec diesel. MB spec. is 229.51. I need help choosing a oil to run. I think I want a 0or5 W40. Our choice is limited in Canada so I am considering Mobil ESP formula or Castrol Edge Turbo Diesel. I need advice, please help.
I use the MB 229.52 in my 2011 E350 BT, but the Mobil 1 ESP 5W-30 is the same thing. The bottles are molded with exact same shape, just different color!
I would go with the 5W-30. I read about a MB bulletin about some problems with the oil cooler due to high viscosity (not 100% sure).
Really, as stated above, anything on the Mercedes site is "Approved" by them, meaning it meets all of the minimum specs required for that engine. Some probably just barely meet it, others probably exceed the minimum requirement. Either way, if you use them, you should be OK for OEM oil change interval.
I personally don't like going that long (10K miles), so I cut it in half. For US, every 5k miles.
Most importantly, do NOT use biotec diesel unless you know FOR SURE that it is less than 5%.
I also like to run a double-strength dose of diesel injector cleaner, such as LiquiMoly Diesel Purge, into a tank of diesel every 3 months or so. Ours gets a lot of short trips. Not ideal for a diesel.
Good luck.