Quote:
Originally Posted by patssle
I've been under the impression my AOS needed to be replaced. I'm burning through about 3 quarts of Mobile1 over each 5000 mile oil change interval. My AOS is 16,000 miles old and there is a slight amount of liquid oil in the tubes between the AOS in the intake. However this evening I connected a pressure gauge to my oil tube and am only pulling 5.6 - 5.8 inches at idle. I hear 5 inches is normal.
Is 5.8 inches reflective of a bad AOS?
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Depends upon inches of what. You should be around five inches of water, while most vacuum gauges are in inches of mercury, where 1 inch of water equals 0.0735 inches of mercury. So if your gauge is in inches of water, you are fine; however if it is in inches of mercury, you are in trouble.