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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 September 10th, 2019, 12:31   #1
halfbytecode
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Default Only Sulphur-free diesel to be used with a certain engine oil?

Hi,

I am currently using Liqui Moly Top-Tec 4100 5W-40 in my car. It says in the Additional Information in the webpage linked below, to only use it with Sulphur-free diesel.

https://products.liqui-moly.com/top-...0-5w-40-3.html

Searching around made it seem that it could mean diesel with sulphur content less than 10 ppm (Euro-6 complaint).

However, we have Euro-4 complaint diesel with less than 50 ppm around here mostly.

Could someone please explain the reason for recommending usage of only sulphur-free diesel with this engine oil?

Is this likely to be an issue for me?
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Old September 10th, 2019, 14:48   #2
CleverUserName
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Quote:
Originally Posted by halfbytecode View Post
Hi,

I am currently using Liqui Moly Top-Tec 4100 5W-40 in my car. It says in the Additional Information in the webpage linked below, to only use it with Sulphur-free diesel.

https://products.liqui-moly.com/top-...0-5w-40-3.html

Searching around made it seem that it could mean diesel with sulphur content less than 10 ppm (Euro-6 complaint).

However, we have Euro-4 complaint diesel with less than 50 ppm around here mostly.

Could someone please explain the reason for recommending usage of only sulphur-free diesel with this engine oil?

Is this likely to be an issue for me?
Fuel quality and Sulfur content directly effects the oil life and interval.

Sulfur, nitric acid and other combustion by-products will deplete the buffering qualities of engine oil. Eventually it may become acidic and cause internal corrosion inside your engine.
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Old September 10th, 2019, 14:58   #3
scooperhsd
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In North America, the spec for onroad diesel is called ULSD (aka Ultra Low Sulfur Diesel). The spec is for 15ppm sulfur, but it is fairly common to find it at 10 ppm sulfur.
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Old September 10th, 2019, 20:57   #4
halfbytecode
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Originally Posted by CleverUserName View Post
Fuel quality and Sulfur content directly effects the oil life and interval.



Sulfur, nitric acid and other combustion by-products will deplete the buffering qualities of engine oil. Eventually it may become acidic and cause internal corrosion inside your engine.
I find it strange they don't mention this low sulphur diesel fuel requirement on the product packaging, and yet they sell the product here.

They also seem to have it in the spec sheet that the product is compliant with Euro-4 emission requirements.

This is a bit strange and contradictory with the sulphur-free diesel usage requirement.

Last edited by halfbytecode; September 10th, 2019 at 21:35.
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Old September 10th, 2019, 20:58   #5
halfbytecode
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Originally Posted by scooperhsd View Post
In North America, the spec for onroad diesel is called ULSD (aka Ultra Low Sulfur Diesel). The spec is for 15ppm sulfur, but it is fairly common to find it at 10 ppm sulfur.
Yes I read the terms ULSD and sulphur-free diesel being used interchangeably.
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Old Yesterday, 10:50   #6
Powder Hound
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Actually, the low sulfur requirements for apply to any diesel equipped with a catalyst here is the USofA. Other countries will have the same requirements depending on their outlook on trying for breathable exhaust. The oil should be low/no sulfur as well, hence the switch to zinc based anti-wear additives (ZDDP) vs. the molybdenum (MoS2) based additive that was used.

Also, it explains why gear oils still contain the moly antiwear: they don't go through a catalyst.

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PH
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