Diesel Engine Oil Specifications: Making Sense of CK-4 & FA-4

Semi truck driving through mountains

The API CK-4 and FA-4 diesel engine oil specifications are designed to help meet tight regulations while providing excellent wear protection.



What’s the Best Heavy-Equipment Grease?

Best heavy-equipment grease

Grease must resist extreme impacts, fight wear, resist water washout and more to be considered the best heavy-equipment grease.



Diesel vs. Gas Engines: What’s the Difference?

Diesel vs gas engine

They burn different types of fuel, but that’s just the start. Here’s what you need to know when comparing diesel vs gas engines.



How to Charge a Car Battery

How to charge a car battery

You can easily charge a car battery with a battery charger or jumper cables in a few minutes. Here’s how to do both.



How Often Should I Change Front or Rear Differential Fluid?

How often to change differential fluid increases if you tow.

How often to change differential fluid depends on your vehicle, driving conditions and differential fluid quality. Learn more here.



How Often Should I Change Transmission Fluid?

Adding transmission fluid to flush machine.

How often to change transmission fluid depends on your vehicle year, make and model, along with your driving habits. Get the details here.



Is it Safe to Add 2-Stroke Oil to My Diesel Fuel?

2-stroke oil in diesel pickup

In general, it’s OK to add 2 stroke oil to diesel fuel for extra lubricity, but it’s far easier and more effective to use a fuel additive.



What Causes Engine Oil Oxidation?

XL Synthetic Motor Oil

Engine oil oxidation can cause deposits, sludge and other performance problems. Synthetic motor oils offer better oxidation resistance.



Which AMSOIL Diesel Oil is Right for Me?

Diesel truck

AMSOIL offers a full line of premium-quality synthetic diesel oils, but which AMSOIL diesel oil is right for your application? We break it down.



What Kind of Grease Do I Need?

What kind of grease do I need?

Consider several factors when choosing the correct grease, including consistency, thickener type, operating temperature, load and more.