If you're responsible for keeping industrial gearboxes running, you've probably faced this question at some point: should you stick with mineral gear oil, or switch to synthetic? The wrong choice doesn't usually cause immediate failure — it shows up months later as premature wear, overheating, or unplanned downtime that's expensive to trace back to a lubricant decision.
What Makes Synthetic Gear Oil Different?
Mineral gear oil is refined directly from crude oil. Synthetic gear oil, on the other hand, is chemically engineered — its molecular structure is designed rather than extracted. This gives synthetic oils a few practical advantages that matter in industrial settings:
- Higher temperature stability — synthetic gear oils resist breakdown at temperatures where mineral oils start to oxidize and thicken.
- Better low-temperature flow — in cold startup conditions, synthetic oil reaches gear surfaces faster, reducing dry-start wear.
- Longer service intervals — synthetic oils typically last 2-4 times longer before requiring a change, which lowers long-term maintenance costs despite a higher upfront price.
- Improved load-carrying capacity — under extreme pressure, synthetic formulations maintain a stronger film between gear teeth, reducing metal-to-metal contact.
When Mineral Gear Oil Is Still the Right Choice
Synthetic isn't always necessary. For gearboxes operating under moderate loads, standard temperatures, and regular maintenance schedules, mineral gear oil performs reliably at a lower cost. Many general-purpose industrial gearboxes in manufacturing plants run on mineral oil for years without issue — the key is matching the oil to actual operating conditions, not just picking the "better" option by default.
When You Should Switch to Synthetic
Consider synthetic gear oil if your equipment falls into any of these categories:
- Gearboxes running continuously in high-ambient-temperature environments (foundries, steel plants, textile units)
- Heavy-load or shock-load applications like crushers, mixers, and extruders
- Equipment where extended oil-change intervals reduce costly downtime
- Machinery operating in extreme cold, where startup lubrication is critical
Cost Comparison: Is Synthetic Worth It?
Synthetic gear oil typically costs 2-3 times more per litre than mineral oil. However, because it lasts significantly longer and reduces wear-related maintenance, the total cost of ownership often works out lower over a 12-18 month period — particularly for equipment running multiple shifts or operating under harsh conditions. For low-duty, easily accessible gearboxes, mineral oil usually remains more economical.
Choosing the Right Viscosity Grade
Whether you choose synthetic or mineral, viscosity grade (typically ISO VG 150, 220, 320, or 460 for industrial gearboxes) must match your equipment manufacturer's specification. Using an incorrect viscosity — even in a high-quality synthetic oil — can cause the same wear problems as using the wrong oil type altogether.
Genuine Gear Oil Supply in Bulk
At Aggarwal Lubricants India, we supply genuine Servo and HP gear oils, including synthetic-blend options, in both bulk barrel and per-litre quantities. Based in Rohini, Delhi, we serve manufacturing units and industrial plants across Delhi NCR with wholesale pricing and pan-India delivery. Our team can help you match the right gear oil grade to your gearbox specifications before you order.