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[Rawze]

(05-24-2020 )Aussie Steve Wrote:  No don't mix mineral and synthetic

personally, even if they are compatable, the main purpose and reason of a synthetic is the viscosity stability through a wide range of temperatures. - Mixing syn with non-syn kinda starts to defeat the reason for using the syn in the first place.

That being said, not that you would always want to .. but in a pinch, or if you had a specific reason to ...

PAO rated synthetic oils can be mixed with non-synthetic. The 'Group IV' rating specifies that an oil is a PAO type oil. Here is a chart of 'Group IV' gear oils that came up on a search. Some even state specifically that they are PAO in the chart as well...
https://pdf4pro.com/amp/view/synthetic-l...b3e6d.html