Can't argue with that.
I've been on Sprinter-Source since 2009. In 12 years you get to know whose opinion to take into consideration. Regarding fluids, essentially everyone agrees that it's best to stick with those on the MB Bevo list. However, many of those same people point out that as long as the MB specs are met, you're good.
One very important spec is SAPs/ash. MB specifies no more that 0.8%. All other mfrs of diesel engines with DPFs call for
Some long-time members of Sprinter-Source who want to continue using 5W-40 have switched to oils like Shell Rotella T6 5W-40 that are
That seems like a reasonable trade-off. With the Fram #F935 however, there is no trade-off -- the ash spec is 0.8%.
The Castrol is good oil, but because I'm not a petroleum engineer, and the two companies use some different testing methods/units it's hard for me to tell if the protection of Castrol's 5w30 = Fram's 5W-40. It may, IDK. But it does seem strange that the viscosity grades would overlap like that.