Like Larry said.

Just do not fall for a blend. With names like Freeze 12, FR-12, or whatever. Another poster was recently 'misled' into a blend conversion.

Insist upon r-12(Dichlorodifluoromethane), and make sure they understand.
Also, try to avoid paying for a full evacuation and recharge. R-12 topoffs really are legal, and any shop that says otherwise is misleading you. If it took many years for cooling to degrade to this point, you probably do not have a repairable leak.

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1986 300E 5-Speed 240k mi.