{"product_id":"castair-cast-lube-1-gal-high-quality-full-synthetic-oil-for-rotary-screw-compressors","title":"Castair CAST-LUBE 1 Gal High Quality Full Synthetic Oil for Rotary Screw Compressors","description":"\u003ch2\u003eCastair CAST-LUBE Full Synthetic Rotary Screw Compressor Oil — 1 Gallon\u003c\/h2\u003e\n\u003cp\u003eThe GA4000 is the factory-specified lubricant for Castair rotary screw compressors. This is not a general-purpose compressor oil — rotary screw compressors have fundamentally different lubrication requirements than piston compressors, and the GA4000 is engineered specifically to meet those requirements. At 83.16 per gallon, it is the most expensive oil in the Castair lineup, and the service interval reflects that: the GA4000 is rated for 1 year or 4,000 hours, which is a dramatically longer service life than any piston compressor oil in the CAST-LUBE range.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Rotary Screw Compressors Need a Different Oil\u003c\/h2\u003e\n\u003cp\u003eRotary screw compressors inject oil directly into the compression chamber. That oil lubricates the male and female rotors, seals the clearances between them, and carries heat away from the compression process. It then gets separated from the compressed air downstream and re-circulated. Because the oil is continuously in contact with hot compressed air under load, it faces oxidation stress that piston compressor oil does not. It also has to stay compatible with the oil separator, the downstream oil filter, and in some cases, the air quality at the outlet.\u003c\/p\u003e\n\u003cp\u003eUsing piston compressor oil in a rotary screw — or worse, automotive oil — will shorten separator life, cause varnish and sludge buildup on the rotors and in the cooler, and potentially void the warranty. The GA4000 is formulated to resist oxidation, inhibit varnish formation, and remain stable through the full 4,000-hour service life.\u003c\/p\u003e\n\n\u003ch3\u003eGA4000 Full Synthetic Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Synthetic Base Oil:\u003c\/strong\u003e Provides superior oxidation resistance and thermal stability compared to mineral or semi-synthetic oils — critical for rotary screw applications where oil is always hot and under load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4,000-Hour Service Rating:\u003c\/strong\u003e One year or 4,000 hours between changes — reduces maintenance downtime and per-hour lubrication cost significantly compared to piston compressor oils\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-Varnish Formulation:\u003c\/strong\u003e Resists the varnish and sludge deposits that develop on rotors, in coolers, and in oil separators when inferior lubricants are used in rotary screw applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeparator Compatible:\u003c\/strong\u003e Will not degrade oil separator media prematurely — changing to off-spec oil is a common cause of premature separator failure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Approved:\u003c\/strong\u003e Castair's specified lubricant for all CASTAIR rotary screw compressors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFoam Resistant:\u003c\/strong\u003e Does not aerate under the rapid circulation of a rotary screw injection system\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eGA4000 vs. Other CAST-LUBE Oils — Which One Does Your Compressor Use?\u003c\/h2\u003e\n\u003cp\u003eCastair makes specific oils for specific compressor types. The differences matter:\u003c\/p\u003e\n\n\u003ch3\u003eRotary Screw Oil\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGA4000 — Full Synthetic, 1 Gallon — THIS PRODUCT:\u003c\/strong\u003e For Castair rotary screw compressors. 1-year or 4,000-hour service interval. Do NOT use in piston compressors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFG4000 — Full Synthetic, 5 Gallon:\u003c\/strong\u003e Same formula as GA4000, bulk quantity for high-volume shops or multi-unit installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePiston Compressor Oils (Not for Rotary Screw)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGA10W30 — Full Synthetic 10W30, 1 Gallon:\u003c\/strong\u003e For Castair piston compressors. 800-hour or 8-month service interval.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGA5W30 — Semi-Synthetic 5W30, 1 Gallon:\u003c\/strong\u003e For Castair piston compressors. 400-hour or 4-month service interval.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eVarnasolv Rotary Cleaner\u003c\/h3\u003e\n\u003cp\u003eCastair also offers Varnasolv, a rotary varnish cleaner. If you are switching to GA4000 from a different brand of oil and suspect varnish buildup, mix Varnasolv at 10%, run 50 hours, then drain and replace with fresh GA4000 and new separator filter. Do not skip the separator filter change — old varnish contamination will shorten the new filter's life.\u003c\/p\u003e\n\n\u003ch2\u003eWhen Does a Shop Need the 5-Gallon vs. 1-Gallon?\u003c\/h2\u003e\n\u003cp\u003eThe GA4000 1-gallon is the right call for single-unit rotary screw installations where you change oil annually. For shops running multiple rotary screw units, or where the compressor holds more than a gallon of oil per change, the FG4000 5-gallon cuts per-gallon cost and reduces ordering frequency. Call us and we can confirm what your specific Castair rotary screw unit holds per oil change.\u003c\/p\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 gallon (128 fl. oz.) of Castair CAST-LUBE Full Synthetic Rotary Screw Compressor Oil\u003c\/li\u003e\n\u003cli\u003eFactory-sealed container\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e GA4000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume:\u003c\/strong\u003e 1 gallon (128 fl. oz.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Type:\u003c\/strong\u003e Full synthetic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Castair rotary screw compressors ONLY — not for piston compressors\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eService Interval:\u003c\/strong\u003e 1 year or 4,000 hours (whichever comes first)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApproved By:\u003c\/strong\u003e Castair factory specification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe have been supplying Castair compressors and genuine Castair consumables since 2016. When it is time to change oil on your rotary screw unit, you want the factory-specified lubricant — not a generic compressor oil from a big-box store that may not meet the formulation requirements for rotary screw injection systems. We stock the full CAST-LUBE line, offer free shipping, and can advise on quantity per your unit's oil capacity. Free tech support is available at 866-217-0063.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342552359125,"sku":"GA4000","price":153.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/OIL_new-768x339_dbf97684-1b66-4ffc-ba87-53fbb53b293a.jpg?v=1772652695","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-cast-lube-1-gal-high-quality-full-synthetic-oil-for-rotary-screw-compressors","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}