Originally Posted By: BoiseRob
If it is Amsoil, I would contact them regarding their warranty...
Why??? The HDD 5w-30 is not the oil recommended by Amsoil for use in the 6.4. The 2008 6.4 requires a CJ-4 diesel oil which would be either the DEO 5w-40 or DME 15w-40 from Amsoil.
Engine Oil
Grade 1......CJ-4
Synthetic 5W-40 Premium Diesel Oil
Premium API CJ-4 Synthetic 15W-40 Diesel Oil
32 to 122°F......10W-30
Above 68°F......15W-40
Above -4°F......5W-40
Under 50°F......0W-40, 0W-30
If it is Amsoil, I would contact them regarding their warranty...
Why??? The HDD 5w-30 is not the oil recommended by Amsoil for use in the 6.4. The 2008 6.4 requires a CJ-4 diesel oil which would be either the DEO 5w-40 or DME 15w-40 from Amsoil.
Engine Oil
Grade 1......CJ-4
Synthetic 5W-40 Premium Diesel Oil
Premium API CJ-4 Synthetic 15W-40 Diesel Oil
32 to 122°F......10W-30
Above 68°F......15W-40
Above -4°F......5W-40
Under 50°F......0W-40, 0W-30