Originally Posted By: Bill in Utah
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TEOST test which tests for deposit control
Found this interesting;
Quote:
Known as ASTM D6335, the original TEOST® protocol simulates the cyclic temperatures of 200° to 500+°C experienced in the turbocharger with a 12-cycle test run over a period of two hours requiring 100+ mL of test oil. The test obtains the weight of deposit forming on a resistively-heated hollow rod (TEOST® Depositor Rod) held within a casing as bulk oil flows by at a rate of 0.45 g/minute. The increase in rod weight caused by deposits is used as a measure of oil performance.
I did not know that the G8 has a turbo?
Check out this...
TEOST info
Love this quote...
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The most important aspect of the TEOST is the separation of the oxidation process into the two aspects
believed to be present in the engine,
Believed?
And the test does not even run in a motor. It is run on a rod that they heat up, pass oil through it at a rate and then weigh the rod.
This is why I don't put too much faith in all of these ratings and tests.
I go with what works in a car over the actual miles operated.
Any one want to order the SAE test paper and report back?
Take care, bill
Bill:
I never once stated that the G8 had a turbo. I just remember a guy who did lubrication testing for GM stating that the only oil that passed one of the tests, which was for a turbo engine, was Mobil 1. Is this necessarily applicable to the LSx motors? No. But it obviously shows the robustness of a particular grade of Mobil 1 in comparison to whatever it was being run against.
As I said, I am sure there is a reason GM recommends Mobil 1. What that reason is, I honestly have no idea other than EM has gone the extra mile (and spent the extra mega-bucks) to have their oils contain a ridiculously long list of certs and approvals.
As your post states, you feel that many of these specs and approvals don't hold much water. That is fine, I am sure that there are many that do. To each their own.