Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil 15W-40, 5 Gallon

from RyanN

Even on the older pre emission trucks, like mine, an old Cummins 12v, the additive package in this oil is quite robust and caters to it too. Awesome value here, esp with rebates combined. Use to run Rotella T6, but don't care for the newer formula in recent memory, so now running this Delvac Ex...

from Desertdog

I use mobil synthetic oils in my vehicles with good results. My local store showed it in stock, but none there. I ordered for pickup, and when it didn't arrive, they shipped it for free.

from davidsjr

No better oil for heavy weight a diesel engine has to power around. Low consumption.

from Robert

Still too early but so far this is the only oil my dmax doesn't burn. It generally burns a quart or two every 7k. A nice side effect is the engine runs quieter as well. We are out of the cold season so can't answer to how it handles cold starts. Great price from Walmart vs auto parts stores.

from Thomas

Just had 3 gallons of this Delvac Extreme 15-40 put in my 2016 Ram CTD. No more clicking and diesel clattering. Really quieted the engine down.