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Abadi55z

"Saudi" Shell Helix Ultra I 5W-40 on Nissan Patrol y61 TB48de after 7500 km

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1 минуту назад, Dimmy сказал:

As for Molybdenum. Actually, I think there should be no Mo in this Ultra I 5W-40. But in your UOA there is some, though twice lower than might be expected. Qiute strange. I don't know what to think. If you are absolutely sure that the previous oil was also Ultra I and the UOA is the same oil that your VOA - then it may be explained by the presence of Mo in Ultra I 5W-40. But why the Lab did not see Mo in the VOA and did it in UOA? The Lab is the same, isn't it?

I'm not 100% sure about the previous oil could be the Mo is residue from previous oil changes.

Yes both Analyzes from the same laboratory.

 

Before a year or so I used an oil with a minimum 55ppm of Mo. 

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37 минут назад, Abadi55z сказал:

Before a year or so I used an oil with a minimum 55ppm of Mo. 

To get 23 ppm of Mo from the previous oil the latter should have had about 300-500 ppm.

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31 минуту назад, Dimmy сказал:

To get 23 ppm of Mo from the previous oil the latter should have had about 300-500 ppm.

Oh that's a lot 

Then it could be an indication of piston ring wear out? 

 

According to this table from Machinery Lubrication. 

 

Bennett_Element_Chart.png

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Abadi55z, I think no. It must be in the oil.

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1 минуту назад, Dimmy сказал:

Abadi55z, I think no. It must be in the oil.

Ok that's convenient.

Thanks for the information.

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13 часов назад, Abadi55z сказал:

Then it could be an indication of piston ring wear out? 

Чтобы столько молибдена настрогало с колец или ещё чего, где он находится как легирующая присадка измеряющаяся в единицах или долях процента, надо, чтобы основного металла было гораздо больше. Но его нет.

Этот молибден из масла.

 

Хороший анализ. Масло в норме. Двигатель в норме. Тихо завидую.

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14 минут назад, Texacoman сказал:

Чтобы столько молибдена настрогало с колец или ещё чего, где он находится как легирующая присадка измеряющаяся в единицах или долях процента, надо, чтобы основного металла было гораздо больше. Но его нет.

Этот молибден из масла.

 

Хороший анализ. Масло в норме. Двигатель в норме. Тихо завидую.

That's a valuable information I appreciate your judgement behalf on the analysis :good:

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