Hello

I have the following problem: I have to change the cooling oil of all of my tool grinding centre
I have talked to several oil suppliers and let them send me an offer.

The offers cover oil of Hydro-Crack basis and PAO basis.

The prices for Hydro Crack are around 2€ / litre and for PAO around 4,60€ / litre.
Can anybody tell me what the price difference is justified.

What are the advantages of PAO oil in contrast to Hydro Crack oil?

Best regards