Technical Knowledge Base

Insights & Technical Guides

Practical lubrication knowledge for engineers, fleet managers, and industrial buyers — written by the Haruto technical team.

Air compressor oil guide: ISO VG 46 to 220, mineral and synthetic formulations and the daily oil checks, shown with a Haruto Compressor Oil 220 5 L pack
Compressor Oils October 2026 11 min read

Compressor Oil Guide: VDL Grades, 68 vs 100 and Mineral vs Synthetic

Choose the right air compressor oil: VDL grades explained, ISO VG 68 vs 100, screw vs piston, synthetic vs mineral, and daily checks for Indian plants.

Read Article →
Cutting oil guide: neat, soluble, semi-synthetic and synthetic metalworking fluids and daily concentration control, shown with a Haruto Smooth Cut 20 5 L pack
Cutting Oils October 2026 11 min read

Cutting Oil Guide: Neat, Soluble and Synthetic Fluids for Machine Shops

Neat, soluble, semi-synthetic or synthetic cutting oil? Match fluid to operation and metal, control concentration and keep CNC sumps healthy in summer.

Read Article →
Lubricant grades in India chart for choosing engine oil, hydraulic oil, gear oil and grease by grade
Buying Guide September 2026 8 min read

Lubricant Brands in India: Who Sells What & How to Choose

The major lubricant brands in India, who owns them, the grades they sell, and a practical checklist for buying engine, gear and hydraulic oil in bulk.

Read Article →
Buying hydraulic oil 68 in bulk: grade, pack sizes and checklist
Buying Guide September 2026 7 min read

Buying Hydraulic Oil 68 in Bulk: Brands & Checklist

AW / HLP 68 in 20 L pails or 210 L drums? The names it is sold under, how to pick pack sizes, and what to check before a bulk order.

Read Article →
Mineral, semi-synthetic and synthetic engine oil compared, shown with Haruto Power Synth 5W-30 and NexaGuard 15W-40 packs
Engine Oils July 2026 8 min read

Mineral vs Semi-Synthetic vs Synthetic Engine Oil

The real difference is the base oil — and it decides protection, drain life and cost. Here's which type is actually worth it for your engine.

Read Article →
Best engine oil for trucks and buses in India: common grades, BS-VI low-SAPS and fleet drain intervals, shown with a Haruto NexaGuard 15W-40 pack
Engine Oils July 2026 8 min read

Best Engine Oil for Trucks & Buses in India (BS-VI)

15W-40 or a lighter BS-VI grade? CI-4 or CK-4? What commercial fleets should run — and why low-SAPS matters for BS-VI engines.

Read Article →
Choosing grease for wheel bearings versus chassis points by temperature, NLGI grade and thickener, shown with Haruto Chassis Pure and MP-3+ grease packs
Greases July 2026 8 min read

Which Grease for Wheel Bearings, Chassis & High Temp?

Use the wrong grease and you get wash-out and bearing failure. A plain guide to picking by load, heat, water and NLGI grade.

Read Article →
Hydraulic oil for JCB and excavators: anti-wear oil and choosing between AW 46 and AW 68, shown with a Haruto NexaGuard Hydro AW-68 pack
Hydraulic Oils July 2026 8 min read

Hydraulic Oil for JCB & Excavators: Which Grade?

AW 46 or AW 68? Why Indian earth-moving usually runs AW 68, the standard to look for, and the contamination mistake that kills pumps.

Read Article →
15W-40 vs 20W-40 engine oil compared: cold-start flow, typical engines and how to choose, shown with Haruto NexaGuard 15W-40 and NexaGuard 20W-40 packs
Engine Oils July 2026 8 min read

15W-40 vs 20W-40 Engine Oil: Which Should You Use?

Buyers assume the thicker oil protects better. It doesn't — both are '40' when hot. The real difference is cold-start flow. Here's which grade suits your engine.

Read Article →
What UTTO oil is: universal tractor transmission oil for transmission, hydraulics and wet brakes, shown with a Haruto NexaGuard UTTO pack
Tractor & Agri July 2026 8 min read

What Is UTTO Oil & Does Your Tractor Need It?

One fluid runs a tractor's transmission, hydraulics and wet brakes — and it isn't engine oil. What UTTO does, and how it differs from STOU.

Read Article →
Diesel engine oil ratings CI-4, CH-4 and CK-4 explained, shown with a Haruto NexaGuard 15W-40 pack
Engine Oils July 2026 8 min read

API CI-4 vs CH-4 vs CK-4: Diesel Oil Ratings Explained

The rating next to 15W-40 matters as much as the viscosity. What CH-4, CI-4 and CK-4 mean, whether they're backward compatible, and which your engine needs.

Read Article →
Private-label and third-party lubricant manufacturing in India: quality, packaging and minimum order quantities, shown with Haruto engine, gear and hydraulic oil packs
Business July 2026 8 min read

Private-Label & Third-Party Lubricant Manufacturing in India

Launch your own lubricant brand without building a plant. How private-label manufacturing works — quality, packaging, MOQs, and how to start.

Read Article →
Starting a lubricant distributorship in India: investment, margins and requirements, shown with Haruto engine, gear and hydraulic oil packs
Business July 2026 8 min read

Lubricant Distributorship in India: Costs & How to Start

Thinking of a lubricant dealership? The real investment, the margins to expect, the paperwork, and a step-by-step way to start — plus how to apply to Haruto.

Read Article →
Best engine oil for tractors in India: common grades and the UTTO transmission oil tractors also need, shown with Haruto NexaGuard 15W-40 and NexaGuard UTTO packs
Engine Oils July 2026 8 min read

Best Engine Oil for Your Tractor in India (2026 Guide)

15W-40, 20W-40 or 10W-30? API CH-4 vs CI-4? And what is UTTO? A plain guide to picking the right oil for your tractor's engine and transmission.

Read Article →
Engine oil viscosity guide
Engine Oils March 2026 10 min read

How to Choose the Right Engine Oil Viscosity

0W-30, 5W-30, 15W-40 — what do these numbers actually mean, and which grade is right for your engine? A practical guide for fleet managers and mechanics.

Read Article →
NLGI grease grades explained
Greases March 2026 10 min read

NLGI Grease Grades Explained

NLGI 0, 1, 2, 3 — grease consistency grades explained simply. Learn which grade suits your bearing type, operating temperature, and application orientation.

Read Article →
Hydraulic oil selection guide
Hydraulic Oils March 2026 10 min read

Hydraulic Oil Selection Guide: AW32 vs AW46 vs AW68

Choosing the wrong hydraulic oil grade causes overheating, seal failure, and pump wear. Here's how to match viscosity to your system's pressure and temperature range.

Read Article →
Lubricant quality and equipment life
Industry Insights March 2026 10 min read

Why Lubricant Quality Directly Affects Equipment Life

Switching to a cheaper lubricant to save costs often leads to higher maintenance bills, unplanned downtime, and shorter equipment life. How to judge lubricant quality before you buy, and prove it in service.

Read Article →
GL-4 vs GL-5 gear oil compared: manual gearboxes versus hypoid axles and the yellow-metal issue, shown with a Haruto NexaGuard Gear Oil EP-90 pack
Gear Oils March 2026 8 min read

GL-4 vs GL-5 Gear Oil: What's the Difference?

GL-4 and GL-5 aren't interchangeable — the wrong one can damage synchromesh brass or leave hypoid gears unprotected. Here's exactly when to use each.

Read Article →
Grease compatibility: whether greases can be mixed, what decides it and how to switch safely, shown with Haruto MP-3+ and Red Gel HAX 100000 grease packs
Greases March 2026 7 min read

Grease Compatibility Chart: Can You Mix Greases?

Mixing incompatible greases can break down their thickener structure and cause bearing failure. Check this compatibility chart before topping up with a different grease.

Read Article →
Lithium versus lithium complex grease compared by temperature and load, shown with Haruto MP-3+ and HBX 50000 grease packs
Greases March 2026 8 min read

Lithium vs Lithium-Complex Grease

Both are everywhere, but lithium-complex greases take far more heat. Here's how they differ — and which one your bearings actually need.

Read Article →