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Informacje na temat estrow oraz ogolna wiedza - Na pytania odpowie Thomas Schaefer (TomNJ)

poziom1989

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@TomNJ What is your opinion on ZnDDP, which also functions as AO. At a higher concentration, there is no need to use a higher concentration of amine / phenolic AO? Also, as the oil contains Mo compounds.
 

TomNJ

Specjalista
Samochód
2019 Nissan Altima 2.5 SL
Depends on the total formulation, the formulator's goals, and test results. Adding or increasing amine or phenolic AOs will generally enhance the oxidative stability of the oil, if that is your goal, but it adds to the cost. The amount and type of AO "needed" is the amount needed to meet your formulation goals.
 

kobzacz

Użytkownik
Samochód
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@TomNJ What's a purpose of oil formulations with narrow viscosity range, for example 15W-30 or 20W-40? Is any application where 20W-50 is better than 5W-50 or 10W-30 is better than 5W-30/0W-30? Maybe it is because less viscosity improvers which results better oil stability?
 

TomNJ

Specjalista
Samochód
2019 Nissan Altima 2.5 SL
Oil manufacturers chose what viscosity grades to offer based on market demand more than technical need. The narrow viscosity range oils are fairly low in volume and represent a small percentage of the PCMO market, at least here in the USA. From a technical standpoint they generally have a higher HTHS viscosity and lower volatility than wider viscosity range oils, which is preferred by some manufacturers of small air cooled engines used in outdoor power equipment such a lawn mowers.
 

kobzacz

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What about cars with air-cooled engines, such as VW Beetle or Fiat 500 '57? Is there olso better to use narrow viscosity range? It's hard to follow manufacturer's recomendations, because they are many years old, and reffering to then times.

Is it good to use benefits from huge development in tribology, and use modern (containing PAO and/or esthers) oils in old, classic cars? What oil parameter is important (if any) in aplications in engines without full-flow oil filter, or having only centrifugal one?
 

TomNJ

Specjalista
Samochód
2019 Nissan Altima 2.5 SL
The right viscosity grade depends on engine design, engine temperatures, and climate. If the air cooled engines run hotter, then a higher viscosity and a more narrow range may benefit, but engine design and condition are also factors so it is hard to say. And you may need a wider range to allow cold temperature starting.

In general, modern tribology brings better additives and base oils than old formulations and should be suitable for older engines along with the right viscosity grade. If I could not find any oil recommendations from my engine manufacture, then I would lean toward a thicker oil in old engines, such as 10W-40, or 5W-40 if cold starting is a factor. I am not a mechanical engineer so this is just an opinion. I don't know what factors affect oil filters.
 
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