[thescreensavers]

Originally Posted by Camaroguy555

Here's the link. https://540ratblog.wordpress.com/201...-test-ranking/

A long read, but definitely a lot of good info. I wasn't referring to oil pressure in the engine, but actually the psi value produced by the oil in terms of wear protection. I'm a huge advocate of trusting the engineers that built the car, but they often have to dumb things down for people who don't educate themselves like we do on forums. According to this guy 30wt oils have the best long term wear protection, you have to ensure it works for your application though ie high temps from track use.

Unfortunately that oil test is completely bogus and testing method is not representative of any place in any engine.

First lets talk about high temps again



As you can see on this chart as temperature increases viscosity decreases. GM has instructed us in order to keep warranty to use a Dexos2 0W40 or 5W40 engine oil. If you read about people tracking their SS they have hit 270F.

Viscosity is higher at all hot temperatures for a 40wt oil vs a 30wt oil thus will offer better protection at the track and thus GM is requiring it for competitive use. These Viscosity's are determined by academically accepted standards.

The testing by Ratrod does not conform to any academically accepted standards API, ACEA, ILSAC, SAE..Dexos...ect do not use the "One arm bandit" in any of their oil tests.

If that oil test was useful you think OEM'S would use it?

For example checkout Porches A40 Oil Spec

This test will last 203 hours. The engine, and the oil, will go through:
- 4 times the simulation of 35 hours of summer driving,
- 4 times the simulation of 13.5 hours of winter driving,
- 40 cold starts,
- 5 times the simulation of 1-hour sessions on the “Nürburgring” racetrack,
- 3.5 hours of “running-in” program
Measurements on the engine and on the oil will be done at regular intervals, and the following parameter
will be taken into account to grant the approval or not:
- torque curve (internal friction),
- oxidation of the oil,
- Piston cleanliness and ring sticking,
- Valve train wear protection. Cam & tappet wear must be less than 10 μm.
- Engine cleanliness and sludge: after 203 hours, no deposits must be visible.
- Bearing wear protection: visual rating according to Porsche in-house method.

If the Ratrod test was at all indicative to oils performance don't you think Porches and all the OEMs can save money in oil testing?

Also Here is M1s Reply to that oil test

The rigs being used in these demonstrations are primarily designed for industrial applications like gear oils where extreme pressure is a necessary and important performance feature. These demonstration rigs have very little to do with modern engines, which is why market leading oils in the industry perform poorly in these tests.

You should ask 540Rat to use Head and Shoulders as it will outperform most oils but I do not suggest you use that in your engine.