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That is the conclusions I am coming to, based on this discussion. Thanks Tom NJ for your trouble, very informative, it's greatly appreciated.

https://bobistheoilguy.com/forums/threads/flash-point-base-oil-quality-performance.292593/ Tom NJ, great, this is just what I have been looking for! Sorry to persist but you mentioned "The problem with flash point is the test reproducibility by ASTM D 92 is +- 9°C (+- 16°F). " In the case...

Very useful. I will have a read. Thanks.

Thanks shortyb that's very useful. I am not a firefighter but it is a noble profession. Mobil only report ASTM D92 Flash point in the data sheets I have. Since it has been falling from 2005, it was used for this comparison. I accept that Noack volatility would probably be a better measure of...

Thanks. I am finding conflicting details on the web and hope I can find clarity here. Mobil for some reason don't quote Noack volatility on their Euro data sheets; they only quote the ASTM D92 Flash point. Hence it is used for the comparison above. Most of the other parameters for Mobil 1...

As stated, I am trying to clarify how important flash point is to overall oil quality (because it seems to be falling). You say not. Thank you for that. Care to elaborate? I have also rephrased my question about fuel dilution.

Thanks Shortyb and Indian. Yes, I wondered if the change in flash point reflected changes in base stock formulation towards group III. I take your point about fuel dilution affecting flash point. Would the flash point simply reflect the most volatile components, such as the fuel dilution, or...

Thank you, I broadly understand the test. Perhaps I wasn't clear, I was hoping for answers to two specific questions: How important is the flash point to overall oil quality? Why is the flash point dropping like this (example provided)?

As a long time viewer of this site, I must say it is a tremendous resource for all things oil. So firstly a thank you. I decided to post for the first time as I have one nagging question that I would be grateful for your thoughts… Over the past several years I have noticed that oil ‘Flash...