Technical Knowledge Base

Insights & Technical Guides

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

Engine oil viscosity guide
Engine Oils March 2026 6 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 5 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 7 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 5 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. Here's what the data shows.

Read Article