Four Seasons
Refrigerant Oil, Ester, GM Retrofit Kit - Four Seasons 26600 - GMT400
Refrigerant Oil, Ester, GM Retrofit Kit - Four Seasons 26600 - GMT400
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Refrigerant oil, Ester, GM retrofit kit, for the Chevrolet/GMC C1500.
Part numbers
Four Seasons 26600.
Fits
R12-to-R134a retrofit conversions specifically.
Why it matters
This is a genuinely disputed choice, not settled consensus. PAG is the official R134a standard and GM's own factory position, but PAG is widely reported to react badly with the residual mineral oil that's nearly impossible to fully purge from an older R12 system, while Ester is reported to tolerate that contamination better. This specific product reflects Four Seasons' own supplier guidance for retrofit applications, not an industry-wide agreed standard, reasonable mechanics land on either side of this.
What you get
One 8oz Ester retrofit oil kit.
Give us your VIN if you're not certain on fitment, we'll check it before anything ships.
Description
Refrigerant oil, Ester, GM retrofit kit, for the Chevrolet/GMC C1500.
Part numbers
Four Seasons 26600.
Fits
R12-to-R134a retrofit conversions specifically.
Why it matters
This is a genuinely disputed choice, not settled consensus. PAG is the official R134a standard and GM's own factory position, but PAG is widely reported to react badly with the residual mineral oil that's nearly impossible to fully purge from an older R12 system, while Ester is reported to tolerate that contamination better. This specific product reflects Four Seasons' own supplier guidance for retrofit applications, not an industry-wide agreed standard, reasonable mechanics land on either side of this.
What you get
One 8oz Ester retrofit oil kit.
Give us your VIN if you're not certain on fitment, we'll check it before anything ships.
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