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post #1 of 5 Old 09-17-2013, 06:51 PM Thread Starter
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what oil to get

first time diesel owner. 02 f250 7.3 122k. My current oil change is almost due. I drive this truck 3-4k miles a year. Live in the Denver area. Can get some cold temps thru the winter. I want to run synthetic. Should I go with a 15w40, or go with a 5w40? Some posts say that a 5w40 is just as good as running a 15w40. Most of the mileage will come in the summer months towing close to 11k pounds. Can get to upper 90's here, if not hit 100. trouble is finding a 15w40 synthetic oil. Would think that a 15w40 might be better than a 5w40 with high temps. What one to pick. Oil would be inline with ford requirements. Thanks for the help. Thanks to all that helped me fix a bad solenoid with the air going to defrost.
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post #2 of 5 Old 09-17-2013, 07:23 PM
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The 15w is heavier/thicker than 5w. 5w better for cold starts. Both are 40 so same grade.
Engine Oil
Grade 1......CH-4
SAE 15W-40 Synthetic Heavy Duty Diesel and Marine Motor Oil (AMEQT)
Synthetic 15W-40 Diesel Oil (DMEQT)
Synthetic 15W40 OE Diesel Oil (OEDQT)
-9 To 90 F......10W-30
Above 10 F......15W-40
Below 30 F......5W-30
Below 0 F......0W-30

Chris
1984 F-350 XLT 4x4 4spd. 6.9 (project)
1996 F-250 XLT 4x4 5spd. 7.3
2001 Excursion XLT 4x4 Auto 7.3
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post #3 of 5 Old 09-21-2013, 12:13 AM
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Go with Rotella 15w-40 or mobile delvac 15w-40. If you want oil for a colder climate, go with Rotella 5w-40. I run the T6 5w-40 synthetic with a spin on filter (OEM filter removed due to oil cooler relocation) and my oil still looked new at 5k.

-Tyler- -Navistar Technician-
2004 F250 CCSB FX4 6.0 - XDP EGR delete, BPD Oil Cooler Relocation, SCT Livewire TS, 315/75/16 Falken Wildpeak A/T's, Rough Country 4in, stock DP with 4in straight pipe.
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post #4 of 5 Old 09-21-2013, 03:25 AM
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I ran Amsoil 15w40 year round in Duramax's and 7.3's. Good oil great performance. If you want that 7.3 to start in cold weather make sure your batteries are good and throw a set of "Good" glow plugs in it. There are some better than stock performers out there.
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post #5 of 5 Old 09-21-2013, 03:38 AM
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You're going to get a TON of response on this one. We have a TON of threads about them.
I've run Amsoil since early on and last time my buddy had my rig apart he said it looked "new" inside. And I'm HARD on mine.

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