The best synthetic oils offer more ... thing to get out of the way. Whatever oil viscosity your car runs, stick with it. If your owner’s manual says 5W30, or 15W40, or 10W60 as an oil viscosity ...

When it’s brand new, a 5W-30 conventional motor oil acts exactly like a 5W-30 synthetic motor oil. Over time, however, the chemical additives used in the conventional oil to alter its properties ...

The two major differences between synthetic and conventional oil are a bit more subtle. First, the way the oils are made create a clear distinction. For example, conventional 5W-30 motor oil is a ...

Given all the options for motor oil options out there ... Automakers usually specify a 5W-20 or 5W-30 oil for colder temperatures, with a 10W-30 oil as optional for higher ambient temperatures.

if a broader motor oil brand ranking is something you might be interested in, we've got one of those lists as well. One last note — we've linked five-quart jugs of 5W-30 Full Synthetic oil ...

Changing motor oil yourself is one of the easiest ways ... and Ford recommends using 5W-30 synthetic blend oil. Read more: The Most Reliable Duramax Diesel Engines (And Which To Avoid) According ...

Synthetic motor oil is a laboratory manufactured ... filter and filled the motor with 5.5 quarts of Royal Purple's SAE 5W-30 motor oil. 3. Our Toyota came with the four-speed automatic ...

Stick with the manufacturer's recommended motor-oil viscosity classification. For instance, if your car uses 5W-30 synthetic oil, upgrade to high-mileage oil with a similar 5W-30 rating.

Synthetic oil used to be something only performance ... The alphanumeric codes on a quart of oil—5W-30, 0W-20, etc.—denote its “weight,” or viscosity. Thicker, higher-viscosity liquids ...