Ryan Gary

Ryan Gary

With a solid foundation of 20 years in the mechanical industry and a Mechanical Engineering degree, Ryan Gary brings a deep understanding of automotive systems to Engine Oil Journal. Driven by a passion for vehicles and a commitment to providing accurate information, he created this platform to empower drivers to make informed decisions about engine oil care.

A/C Pressure Diagnostic Chart(For All Causes + Solutions)

A/C Pressure Diagnostic Chart

When your car’s air conditioning (A/C) system isn’t cooling as expected, the first step in diagnosing the issue involves checking both low-side and high-side pressures using a manifold gauge set. These readings provide insights into refrigerant charge levels, compressor health,…

Car AC Gauge Reading Chart(Complete Guide)

Car AC Gauge Reading Chart

One of the most effective ways to diagnose AC performance is by using an AC manifold gauge set to measure system pressure. These readings help determine whether your system is properly charged, overcharged, or suffering from leaks or component failures.…

60/40 Coolant Mix Chart(Complete Guide)

60/40 Coolant Mix Chart

When it comes to keeping your engine running smoothly and efficiently, the coolant mixture plays a vital role. A 60/40 coolant mix, which means 60% antifreeze and 40% distilled water, is one of the most reliable ratios for drivers who…

Transmission Fluid Temperature Chart(Comprehensive Guide)

Transmission Fluid Temperature Chart

This guide provides a detailed Transmission Fluid Temperature Chart, explaining normal, optimal, and dangerous temperature ranges for various vehicles and conditions. Whether you drive a car, truck, or heavy-duty vehicle, understanding fluid temperature helps you extend transmission life and avoid…

Year to VIN Chart(From 1980–2069)

Year to VIN Chart

Every vehicle built since 1981 carries a unique Vehicle Identification Number (VIN), a 17-character code that tells you important information about the vehicle, such as the manufacturer, assembly plant, engine type, and most importantly, the model year. The Year to…

AC System Pressure Chart(For All Refrigerant Types)

AC System Pressure Chart

The AC system pressure chart provides both the low-side (suction) and high-side (discharge) pressures for different types of refrigerants under various ambient temperatures. This ensures the system runs efficiently and prevents compressor damage or poor cooling performance. Below, we provide…

Oxygen Sensor Voltage Chart(Complete Guide)

Oxygen Sensor Voltage Chart

Oxygen (O2) sensors are vital components of modern vehicles, responsible for monitoring the air-fuel ratio in the exhaust gases. By detecting oxygen levels and sending voltage signals to the Engine Control Unit (ECU), these sensors help the engine adjust fuel…