The OilHub journal
Practical guides to engine oil: how to read viscosity and approvals, when to change oil, and what our climate and traffic do to an engine.
Engine oil viscosity: what 0W-20, 5W-30 and 5W-40 mean
How to read the SAE grade: what the numbers before and after the W measure, why “thicker oil for summer” is a myth, and how to pick the right viscosity.
When to change engine oil: mileage is not the only guide
Why 10,000 km in traffic and on the highway load the oil differently, how to think in engine hours, what the dipstick and oil colour tell you, and when to shorten the interval.
API, ACEA and manufacturer approvals: how to read an oil label
What API SP, ILSAC GF-6A, ACEA C3, dexos1 Gen 3 and VW 504 00 mean, how “approved” differs from “meets”, and which specification matters most.
Traffic, heat and dust: how severe conditions affect engine oil
Why city driving in Uzbekistan counts as “severe service” by carmakers’ standards, what happens to oil at +45 °C in traffic, and how to help your engine last.