0W-8 Oil.

I love the line also “most wear occurs on startup”

then the manufacturer designs a feature to start up the engine constantly all day long while driving.

 

Here is a quote from Pennzoil’s website. Sounds about as scientific as “get your 10th booster it will work this time”

“As newer engines are built smaller and running hotter, a thinner weight oil such as 0W provides protection to critical engine parts, while also providing other benefits such as fuel economy and extreme temperature performance.”

 

Well, let's remember, start stop is not the same thing as startup from cold when all oil has drained. If you start a recently running engine, there's still film of oil present.

As far as engines being built smaller, are can agree that this is true. New tundras are a testament to this statement.

Cant wait to try out 0w8 in my push mower. It's a small engine.

 

Correct its not the same as a cold start. However any start is less oil on the upper valvetrain than a running engine.


Their statement is that newer engines run hotter so they want thinner oil…. That part sounds ridiculous

 

Perhaps it wasn't phrased appropriately? Smaller engines run higher rpm. I'm wondering if higher rpm's will benefit from thinner oil.

 

Maybe?

The engine Toyota has running 0W-8 doesn’t spin particularly fast though.

If we had some lubrication experts, engineers, and chemists here they could probably explain lubricant performed metrics vs viscosity in a way dumb dumbs like us could maybe understand.

Taking a stab at it I will make an educated guess that a few things are true:

1.) Engine lubricating oil technology has advanced to the point that a low viscosity oil that flows really well is also capable of maintaining adequate shear and film strength for a lot of applications.

2.) The engines I have been able to find running this very lightweight oil are not high performance, high cylinder pressure, high torque units. They’re economical low output appliances.

3.) The manufacturers of the oil and the engines have validated that under normal conditions the oil will protect well enough to maintain minimal warranty claims.

4.) The engine manufacturer has found an advantage in using this lightweight oil to lower emissions, or improve fuel efficiency enough to make it worthwhile to specify this oil. Helping them avoid fines, and “future proof” an engine against tightening regulations.

As an end user I am skeptical, but if 0W-16 can be used too (or 0W-20) I would change the oil early after purchase/in service at maybe 1,000 miles and send a sample in for oil analysis. Then follow up with another OCI 3,000-4,000 miles later and send that oil in for analysis. If the reports come back OK/normal then great, if they’re worrying move to a slightly heavier oil weight.

Most importantly argue about what the correct oil is on Internet forums. Literally the most important subject to be discussed by man kind!

 

it; stop using common sense

 

Hung like that Hugrid?