Auto-Rx rinse. Do a UOA or wait?

[jsharp]

Just finishing a 2 bottle Auto Rx treatment on our Pathfinder and I'm wondering if I should do a used oil analysis on the rinse oil or wait until the next change.

We've run the rinse longer, 3000+ miles and I'd like to see how the Motorcraft 5w30 blend held up and get a baseline on the engine. But I've noticed that the numbers we see are usually quite high on the Auto Rx rinse.

So, do it this time or wait for the next change? I don't intend to run the Motorcraft oil next interval since I have some Rotella 5W-40 I want to use up. If I wait, I'll miss seeing how the Motorcraft held up. But, the numbers may be more representative of what I'll see in the future.

Opinions?

 

[medic]

It seems that the rinse oil usually sees all of the abuse from the AutoRX treatment. Most of the junk in the engine isn't released during the cleaning phase. It's the rinse oil that ends up with all of the junk inside of the engine. Therefore, if you do a used oil analysis on the rinse oil, you'll probably see abnormally high levels of a bunch of junk and very little knowledge of how the engine is doing or how well the oil did inside of the engine.

 

[GROUCHO MARX]

If you don't have a pre-A-Rx UOA as a baseline, what info would this UOA give you?

 

[jsharp]

quote:

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Originally posted by GROUCHO MARX:
If you don't have a pre-A-Rx UOA as a baseline, what info would this UOA give you?

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Probably not much. We bought the vehicle 12K miles back and have done the double bottle treatment on it. I'm just dying to find something out about the condition of the engine...

So far all we know it that it uses no oil in 3000 miles, doesn't require any water, runs at normal temps, etc.

We can certainly wait another 5K miles...