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post #1 of 3 Old 09-17-2007, 12:18 PM Thread Starter
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Question Yes, Another Oil Question...

It has been awhile since I've dabbled into the forced induction world. The last time was 7 years ago. I had a turbocharged car and used synthetic oil exclusively. I remember reading (but not where) that the characteristics of the synthetic helped lubricate the turbo bearing better. I've also seen that the term "synthetic" isn't what it meant back then either. I guess if you highly filter oil then you can call it synthetic.

I recently acquired this truck and it has lived on Shell Rotella T 15w40 for some time. I was thinking about going to Rotella Synthetic 5w40 for better lubrication including the turbo bearing. But after reading all the posts about oil and that most people are using dino I'm not sure. Am I just an old gasser geezer who has trouble letting go or is there merit to what I used to believe in?

If guys in their KW's, Peterbilt's and Freightliner's are using dino then I'm inclined to believe that it isn't worth double the price to go synthetic. I've got not problem changing oil every 3-5K with dino.

Either way I'm sticking with Shell Rotella T. I'm just teetering between dino 15w40 or "synthetic" 5w40. I live in San Diego so weather isn't a concern.

Can anyone give me the lowdown for my diesel engine?

'03 F-250 Lariat FX4 CC/SB (7.3L of course!)

Stuff: Pre-Pump In-Tank Mod (, SS HPX (, 203F Thermostat w/Billet Housing (

Fluff: Gaylord's Fiberglass Tonneau, AIH Delete (self), aFe Pro-Guard 7 Magnum Flow OEM Replacement (, Harpoon Mod (self)

"A little nonsense now and then, is relished by the wisest men." - Willie Wonka
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post #2 of 3 Old 09-17-2007, 02:11 PM
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I switched this past winter to 5w-40 rotella. I live in a cold climate in the winter, and it made a world of difference for me. I guess its personal preference on what oil you use.

2002 F-250 4x4 EC, SRW, SB
Auto 93,000 miles
DP Tuner F5
ATS Compressor and 1.0 Exhaust housing high flow back plate
Turbo Back 4" Silverline Exhaust Mbrp Muffler Delete
Isspro Trans,Pyro,Boost Triple Pod
Fumoto Oil Drain Valve
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post #3 of 3 Old 09-17-2007, 02:17 PM
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I have to agree with vital.....Rotella is also good! Just keep it maintained IMO

Lloyd Vice Director of Virginia Strokers
2006 F350 6.0L SuperDuty Lariat 4x4
Magnaflow 4" S.S. Turbo Back, Lost Cat, 5" S.S. Tip
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