{"product_id":"refrigerant-oil-ester-gm-retrofit-kit-gmt400","title":"Refrigerant Oil, Ester, GM Retrofit Kit - Four Seasons 26600 - GMT400","description":"\u003cp\u003eRefrigerant oil, Ester, GM retrofit kit, for the Chevrolet\/GMC C1500.\u003c\/p\u003e\u003ch3\u003ePart numbers\u003c\/h3\u003e\u003cp\u003eFour Seasons 26600.\u003c\/p\u003e\u003ch3\u003eFits\u003c\/h3\u003e\u003cp\u003eR12-to-R134a retrofit conversions specifically.\u003c\/p\u003e\u003ch3\u003eWhy it matters\u003c\/h3\u003e\u003cp\u003eThis 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.\u003c\/p\u003e\u003ch3\u003eWhat you get\u003c\/h3\u003e\u003cp\u003eOne 8oz Ester retrofit oil kit.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eGive us your VIN if you're not certain on fitment, we'll check it before anything ships.\u003c\/em\u003e\u003c\/p\u003e","brand":"Four Seasons","offers":[{"title":"Default Title","offer_id":50209123696890,"sku":"OBSAE-GMT4-00117","price":199.0,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/5131\/8266\/files\/Air_Conditioning_Compressor_Oils_26600.png?v=1788281018","url":"https:\/\/obscureparts.com\/products\/refrigerant-oil-ester-gm-retrofit-kit-gmt400","provider":"Obscure Parts","version":"1.0","type":"link"}