As I understand, PAG oil is for systems which have never seen R12. Ester is the oil used in converted systems. Steve is bringing forth new information regarding the synthetic, sounds great.

I have understood for quite some time that PAG is ONLY for original R134A systems, if this is not true, I hope someone will straighten me out.

Good luck,

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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles