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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 cannot think of a technical reason why GTL based oils should show increased oil consumption. Increased consumption is sometimes a mystery and sometimes noted when just changing brands.[USER = 1304] @TomNJ [/ USER]
If we are talking about GTL, did you hear users opinion, that oils based on GTL, shows increased consumption?
I'm talking about Shell Helix Ultra mainly.
I dont know how to verify this phenomenon.
Oils are characterized by low NOACK values.
No we never ran these tests.[USER = 1304] @TomNJ [/ USER] You tested the lubricants for Hildebrand Solubility Parameter or Kauri-Butanol Value?
Lose what properties?Good evening,
This topic is really interesting:
So, can we use modern synthetic oils in older and old engines (constructed in 90s or a bit earlier) without contraindicates (obviously if engine is in good condition) to help them to retain the best condition for years? I mean mostly real synthetics oils made from PAO plus esters.
I would like you to ask the question from other news: does the oil with significant amount of esters (mostly oils for more agressive engine treatment, but I don't mean pure motorsport oils) can lose faster their properties that conventional ones especially, when using on short distances in the city?
Well, I guess the concentration of esters can be within following range: 8% up to 15% (assuming by available VOAs). I mean oils like Amsoil Signature Series, Millers Oils CFS series or/and Penrite Racing. To be honest the last ones are the main point of my interest, because they have higher ZnDDP level, which can be desired by older and old engines.Lose what properties?
I need to somehow clarify my question: well for me as I am not a chemistry specialist it is difficult to say exactly what these properties shold look like I have read somehow in the internet that these strenghten motor oils can degrade a bit quicker that rather conventional synthetic oils when using also in the cities. It can be true or maybe these oils can protect even better engine in this mixed working conditions (driving in cities and long routes) ?Lose what properties?
I did extensive work with various anti-oxidants, but only in esters, mostly POEs. In esters we found amine types most effective, although we did use a mix of amine and phenolic types in a couple of products. Jet engine oils, which are 95% POE, use only amine AOs, usually two different ones to exploit synergies. I believe phenolics are more commonly used in hydrocarbon based oils, but I am not sure if the reason is performance or cost.[USER = 1304] @TomNJ [/ USER] Have you tested different antioxidants? Which did you think worked best? Based on research, the amine antioxidant stands out.
Or is it best to find a balance, use a phenolic / amine antioxidant mix and the appropriate Mo compound and the classic ZnDDP?
I would not have any problem using modern synthetic oils in older engines from the 90s. And I would not expect oils containing esters to lose performance in short trip service.[USER = 1304] @TomNJ [/ USER]
I need to somehow clarify my question: well for me as I am not a chemistry specialist it is difficult to say exactly what these properties shold look like I have read somehow in the internet that these strenghten motor oils can degrade a bit quicker that rather conventional synthetic oils when using also in the cities. It can be true or maybe these oils can protect even better engine in this mixed working conditions (driving in cities and long routes)?