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I was curios, so I did some test yesterday , stationary test first .....till my engine oil hit 95C+ and then I went to Shell fuel station.
M276.820 3.0 Turbo
The oil viscosity vs temperature data below for reference/comparison is from here : https://wiki.anton-paar.com/en/engine-oil/
Closest I can get is only 5W40 Liquid Moly H-T is available, no zero W40.
I do not know how to translate kinematic viscosity to oil pressure, but at the least we know the typical oil kinematic viscosity supposed reduction at higher temperature/s.
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The test........... it is from Log 027
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The zone I marked light orange-red is me trying to find 42ish PSI, where the piston spray oil jet is fully spraying well and for the last one... at 1,498 seconds is me finding 54PSI maximum oil pressure while at lowest RPM,
at hot oil temperature.
Below is the last few seconds before engine kill where I have arrived at Shell fuel station
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600ish RPM is when AC compressor I turned OFF.
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Part of this test was my car 2 weeks un-used and I use compression test feature of Xentry to prime my oil pump. I do it 3 times Compression Test, each worth 6 minutes of cranking
at approx 200ish RPM.
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I use 1,300ish RPM as start of engine, because that is the RPM it will kick into when engine starting, be it COLD or WARM, 1,300RPM is what ECM does.
If COLD, the 1,300 - 1,200 RPM is held like 30+ seconds, if warm start it will be only like 0.4 to 1 second only.
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Tomorrow I will add a non-primed engine oil pressure, after 2 days engine kill.
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Yesterday I have a 4 hours engine kill data, but I am seeing what I hope is an electrical glitch on my oil pressure sensor.
So tomorrow I will know more with a 2 days engine kill data.
Here is the 4 hour engine kill data upon starting.
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1.4 second to 7.8 seconds or 6.4 seconds is way too long. Worse case I have seen a week long engine kill would be approx 4ish seconds oil pressure build up.
The 1.2 to 3.6 seconds zone is what does not make sense, that is a pressure rise and then down, albeit very small 0.86 PSI at 1.8 second , it should not be at 0.12PSI at 3.6 second.
The rest of the journey home is good, no glitch in oil pressure.
Boy I don't know. Was there any noise during the post 4 hour shutdown start. I wouldn't count on it being an electrical glitch. It's almost like the filter draining and then having be be refilled.
Today, 11:57 AM
