Why is the 6.4L de-rated in the mega cab. I haven't seen that anywhere. I almost ordered one in the mega cab and wished I would have have but would have been pissed to find this out afterwards... Lol.
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My printed brochure under the heading of "2014 RAM 2500/3500 Buyer's Guide" states "367Hp Mega Cab".
I just downloaded the latest version and it now states;
6.4L HEMI V8 gas engine with MDS / 6-speed automatic (66RFE)
410 hp/429 lb-ft of torque (370 hp 3500 Mega Cab® only)
Count on best-in-class[1] gas horsepower
from the 6.4-liter HEMI V8: 410 hp (and
370 hp for 3500 Mega Cab® only). It's
the ideal for acceleration and highway
merging and cruising, even under the
heaviest loads.
In my printed brochure it states; ...(and 367 hp for Mega Cab)
So clearly, only the 3500 Mega gets derated. And Ram is now making that distinction.
As far as the oil goes. I am a bit of a nut job in that regard. I would go 3000 or so on the initial fill. The oil requirements are pretty clear though. 0W40 meeting Chrysler spec MS-12633. Pennzoil Ultra 0W40 synthetic (factory fill) My dealer stocks it. Mopar 0W40 68171066GA (1L) There is a Mobil 1 0W40 European Formula but I couldn't find that it met the Chrysler MS-12633 spec. There is also the European Formula Castrol Edge 0W40, again not sure if it meets the Chrysler spec. I use Amsoil products in my cars as well but Amsoil does not make a 0W40.
0W-40 Synthetic Oil | Mobil 1™ 0W-40
From the RAM owners manual;
Engine Oil Viscosity – 6.4L Engine
Use Pennzoil UltraTM 0W40 engine or equivalent
MOPAR oil meeting the Chrysler Material Standard
MS-12633 for use in all operating temperatures.
The engine oil filler cap also shows the recommended
engine oil viscosity for your engine. For information on
engine oil filler cap location, refer to the “Engine Compartment”
in this section.
Synthetic Engine Oils
You may use synthetic engine oils provided the recommended
oil quality requirements are met, and the recommended
maintenance intervals for oil and filter changes
are followed
Olli