oil viscosity

Engine Oil Fundamentals

Fuel Dilution: How Modern Engines Make Oil Thinner Than Designed

Inefficient combustion and advanced engine systems cause fuel dilution, thinning oil beyond its designed viscosity and risking engine health—discover how to prevent this.

OilSpec Guide Team
April 15, 2026

View Post

Compatibility & Mixing

Switching to a Higher Viscosity: The 3 Checks Before You Do It

Outstanding insights on switching to higher viscosity oil require three crucial checks before proceeding—discover what could impact your engine’s performance.

OilSpec Guide Team
April 1, 2026

View Post

Viscosity & Grades

Towing and Oil Viscosity: The Simple Heat Rule

Curious how the simple heat rule for oil viscosity can keep your engine protected during towing? Discover the key to optimal engine performance.

OilSpec Guide Team
March 17, 2026

View Post

Viscosity & Grades

Track Days and Oil: Why Temperature, Not Speed, Changes Viscosity Needs

During track days, engine oil viscosity is mainly affected by temperature, not…

OilSpec Guide Team
March 17, 2026

View Post

Viscosity & Grades

Is 0W-40 ‘Too Thick’? The Answer Depends on This One Spec

Just knowing if 0W-40 is too thick depends on this one crucial spec your engine requires.

OilSpec Guide Team
March 16, 2026

View Post

Viscosity & Grades

Viscosity and Fuel Dilution: Why Thin Oil Can Be a Symptom, Not a Choice

thin oil indicates potential contamination

Meta description: “Many drivers overlook thin oil signs, but understanding viscosity and fuel dilution reveals why this issue may indicate deeper engine problems needing attention.