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post #1 of 15 Old 08-19-2010, 02:15 PM Thread Starter
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conventional vs synthetic

Hey all,

I've been running Rotella T in my 97. I know for roughly 2x the price, I can move up to Mobil1 Truck or Rotella synthetic, but is it worth it? For conventional Rotella, should I keep the service to a religious 3k? How does it hold up to 4k or 5k interval?

What are your opinions and interval practices? I do worry a bit about stretching out the interval with a turboed engine.
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post #2 of 15 Old 08-20-2010, 07:34 AM
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I'd just keep using Conventional oil and service it at 3k. You can go out to 5k IMO with synthetic oil, but the price just doesn't justify it. The HEUI relies on good oil. I'd stay with what your doing.

1997 Ford F-350 4x4 SRW regular cab manual trans.
-Rosewood 160cc, 17*HPOP, EPBV delete, 4.10s, 315/75r16

1996 Ford F-350 4x4 SRW CCLB manual trans. CALI spec
-ATS intercooler, WW2 w/ 1.0 housing/EPBV delete, Comp 910s, SD Efuel, 3.55s, 315/75r16

2002 Ranger FX4 with manual transfer case and Alcoa's
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post #3 of 15 Old 08-20-2010, 08:06 AM
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I switch 2 oil changed ago to the Rotella T6 Synthetic from the conventional Rotella. I was running3-4K on an oil change I ran 5500 on my first synthetic and changing it today it looked cleaner than conventional at 3K. This time I went with the larger 2qt filter and will go 6K before I change it. I don't know if it has improved the fuel economy but I think it runs smoother. and for an extra $40ish I'm willing to try it.

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #4 of 15 Old 08-20-2010, 08:32 AM
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It should run a little smoother on fresh and/or syn. oil.

1997 Ford F-350 4x4 SRW regular cab manual trans.
-Rosewood 160cc, 17*HPOP, EPBV delete, 4.10s, 315/75r16

1996 Ford F-350 4x4 SRW CCLB manual trans. CALI spec
-ATS intercooler, WW2 w/ 1.0 housing/EPBV delete, Comp 910s, SD Efuel, 3.55s, 315/75r16

2002 Ranger FX4 with manual transfer case and Alcoa's
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post #5 of 15 Old 08-20-2010, 08:49 AM
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Motorcraft 15-40 oil and filter every 5k as recommended by Ford. My truck runs the same at 1 mile on fresh oil as it does at 4999 miles on old oil. I will never go past 5k, and 3k is not necessary. but to each their own. Most techs will recommend MC or Rotella conventional changed every 5k, no more no less.

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post #6 of 15 Old 08-20-2010, 09:26 AM
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Mine starts and idles smoother on fresh oil...using the 15w40 Motorcraft...I also have 250K, I'm sure it's getting a little tired.

1997 Ford F-350 4x4 SRW regular cab manual trans.
-Rosewood 160cc, 17*HPOP, EPBV delete, 4.10s, 315/75r16

1996 Ford F-350 4x4 SRW CCLB manual trans. CALI spec
-ATS intercooler, WW2 w/ 1.0 housing/EPBV delete, Comp 910s, SD Efuel, 3.55s, 315/75r16

2002 Ranger FX4 with manual transfer case and Alcoa's
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post #7 of 15 Old 08-20-2010, 09:44 AM
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I also have 250K, I'm sure it's getting a little tired.
It's just getting broke in

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #8 of 15 Old 08-20-2010, 11:26 AM
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I beg to differ, It will more then likley need a rebuild in the next 75K miles.

1997 Ford F-350 4x4 SRW regular cab manual trans.
-Rosewood 160cc, 17*HPOP, EPBV delete, 4.10s, 315/75r16

1996 Ford F-350 4x4 SRW CCLB manual trans. CALI spec
-ATS intercooler, WW2 w/ 1.0 housing/EPBV delete, Comp 910s, SD Efuel, 3.55s, 315/75r16

2002 Ranger FX4 with manual transfer case and Alcoa's
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post #9 of 15 Old 08-20-2010, 11:46 AM
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i'd like to get mine to 350K before I pull it. that's 4-5 yr the way I drive.

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #10 of 15 Old 08-20-2010, 03:34 PM
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454,000 and change, needs injectors, but other than that and a little cold natured (might need gpr) runs pretty good. 15-40 rotella 5-6000 miles
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