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Fuels & Lubricants Discussion all about Fuels & Lubricants. synthetic oil, conventional oil, brands, change intervals, diesel grades, gelling and such debated items like that. Non TDI related postings will be moved or removed. This forum is NOT for the discussion of biodiesel and other alternative fuels.

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Old May 12th, 2020, 09:23   #1
travis45
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Default High quality oil for high horsepower application

Hello,

Just about to crank my rebuilt common rail engine for the first time and want to select an appropriate oil once it's broken in. Earlier I've been running Rotella T6, but I'm afraid that the cheapness will shine through.

In this engine I'll be shooting for north of 300hp with KS sputter bearings, stock oil clearance.

Was looking at a couple Luiqi Moly options, maybe Top Tech 4100 5w40 or Leichtlauf 5w40.

Or perhaps Motul 8100 X-cess 5w40.

Obviously DPF is deleted so that is a non issue spec wise. Just want a high quality oil to protect my build.

Any input from oil experts is appreciated.

Respectfully,
Travis
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Old May 12th, 2020, 09:34   #2
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I wouldn't call myself an oil expert, but the 5w40 T6 is more than adequate, imo. Just don't push it much beyond 10k miles. If you are going to be running hot laps at the track I'd consider something like Mobil1 15w50.
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Old May 12th, 2020, 09:38   #3
oilhammer
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Every oil thread synopsis:

"I have used A brand oil and it works great!"

"I have used B brand oil and it works great!"

"A brand oil sucks!"

"B brand oil sucks!"

"You're all idiots, C brand oil is better than any of them!"

"You should run Amsoil for everything, including your lawn mower!"

"Everybody is stupid!!!"



Like we really need another oil thread.
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Old May 12th, 2020, 12:46   #4
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You might want to try Total Quartz Racing 10w50 oil. Maybe withstand heat better. I used to run Quartz 7000 10w50 in my ALH on track days.
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Old May 12th, 2020, 18:43   #5
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I think I could have worded my question better. I'm more interested in learning about the real world results from varying from OEM oil weights rather than the Ford vs. Chevy arguments about the brands of oil.

I've heard rumor that T6 has had some kind of formula change. Not sure if it is true or not. I've used it for years and never had any kind of issue. But the $15 a jug price makes me wonder. IDK, maybe it's fine...

I don't have a good understanding of what it means or if it is a good idea to stray from the OEM oil weights.

If I'm running the stock bearing clearances and run a heavier oil, is that safe? What about something like a Mobil 1 Racing 0w50?

This car really won't be used in winter, and I have added an oil cooler. Will be for spirited weekend abuse and occasional track days. Appreciate the suggestion for the 10w50 IBW. Will take a look.

Appreciate the advice.

Travis
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Last edited by travis45; May 12th, 2020 at 18:47.
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Old May 13th, 2020, 03:00   #6
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I think the higher top number would be helpful, as the engine will generate more heat than stock. When I was running my ALH on the track I'd regularly see coolant temps in the 240-260 range. Didn't have an oil temp gauge but that got hot, too.

Rotella is different from years ago. It's been reformulated to be a low ash oil so it can be used in diesels with particulate filters. Don't know how it's affected the rest of its performance. Still a good oil, however. Delvac, which is similar, is more likely the same as the "old" Rotella.
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Old May 13th, 2020, 04:57   #7
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I would run a Euro spec oil -- Castrol, Luqimoly, or Amsoil, etc and if you are racing just change the oil more often - at least every 5k.
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Old May 13th, 2020, 05:15   #8
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IBW, when you say the top number, do you mean first or second? The 5 in 5w40 or the 40?

Thanks,
Travis
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Old May 13th, 2020, 05:27   #9
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The 40.
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Old May 13th, 2020, 09:06   #10
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Here is the site to go to for oil questions:
https://www.bobistheoilguy.com/forum.../forum_summary

I would contact this place for oil if it was my car. Get what you are paying for:
https://www.hploil.com/motor-oil
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Old May 13th, 2020, 12:45   #11
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Use an appropriate break in oil for the first run. After it’s broken in, drain and refill with an appropriate HP diesel specific oil. The required viscosity can be verified by observing your operating oil temps, extra heat requires a higher viscosity to maintain the same film thickness.

Notable mentions:

1. Driven DP40 5w40
2. Renewable Lubricants BioSyn HD 5w40 or 15w40
3. Redline 15w40
4. Phillips Triton ECT 5w40
5. Amsoil Dominator 20w50

Or you can just go to Walmart and buy the cheapest diesel oil on the shelf and hope for the best.
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Old May 13th, 2020, 14:28   #12
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Thanks for the links and comments.
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Old May 13th, 2020, 22:18   #13
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This is what I'll be running in my RTDI once James gets it back together.
https://products.liqui-moly.com/oils...-10w-60-1.html

I used to run this if you're looking for another option.
https://www.schaefferoil.com/9000-racing-oil.html

You could also try this oil.
https://www.motul.com/us/en-US/products/sport-5w50
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Old May 14th, 2020, 07:55   #14
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3L3M3NT, thanks for the links.

Are you running stock oil clearances on your rod and main bearings?
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Old May 14th, 2020, 08:39   #15
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I honestly don't know, but I'm sure that James would be able to answer that question. If I had to guess I would say yes my engine has stock clearances. If I remember correctly there was a picture from the original engine build.
http://forums.tdiclub.com/showpost.p...7&postcount=32
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