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post #1 of 3 Old 08-20-2011, 08:03 PM Thread Starter
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Quick Question

I've always run 15W-40 in all of my diesel engines, but I've noticed that a lot of people on here run 5W-40. What's the reason for this? I'm close to the 5,000 mark on my oil change, so I want to put a full synthetic in it- what would be better for our 105+ F heat down here in Louisiana in this 6.0? 5W-40 or 15W-40? Thanks! Preston

2005 F-250 Lariat FX4 CC SB
Sinister EGR Delete
Diamond Eye 5" Turbo Back Straight
OEM Gaskets and ARP Studs...
SCT X3 (Quick-Tricks tuning)
S&B Intake
Edge CTS
Full Syn 15w-40
High idle mod
PMM Coolant Filter
Rebuilt FICM with Atlas 40

2006 F-350 XL RC/Flat Bed
EGR Delete
SCT SF3 (stays on tow agg)

Diesel spark plugs are the bestest spark plugs....
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post #2 of 3 Old 08-21-2011, 07:48 AM
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here is the debate on oil

Best Oil in a 6.0
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post #3 of 3 Old 08-21-2011, 08:44 AM
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Google SFR products and watch the demo. Truly amazing and I have seen the demo live using my own products. A friend of mine has run the stuff for 15 years. Ran it in his 89 Dodge Cummins 500K + miles. Ran it in his Getrag 5 speed and never had any trans failures, same in the diff...never had to rebuild the diff in that many miles. For oil I run Valvoline synthetic...high temps...no real noticeable issues with the 5w40. I may switch to Mobil1 Turbo 15w40 only because my oil temps tend to run a little high when I tow...IDK.

2005 F-450 CC Fontaine Conversion
(It's the heavy GVW one with the Dana 135, 4:88's and bigger brakes)
Link Air Ride Suspension
Banks Stuff (CAC, Exhaust)
SCT x3 with Eric's tunes
Bullitt Proofed (EGR mod, Remote oil cooler/filter)
Odyssey AGM's
High Idle Mod, CCV Mod
More $$$ to be spent i'm sure!
2001.5 Dodge 3500 CC
5.9 Cummins/6spd shaker
WAY too much reliable power
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