OIL PSI / BRAND / WEIGHT

[rockola1971]

I know my engine ACTUALLY idles at 600RpM, because I checked.

Did you use a strobe? That is calibrated with a calibrated frequency counter? What percentage was it calibrated too? You see where im going here? I use to be an electronic tech in the industrial field that performed calibration of instrumentation and sensors. It gets really expensive the tighter the tolerances of calibration are calibrated too. The equipment to perform the work can get very expensive. But again we are just dealing with 30-40psi and 10% error really isnt that big of a deal clocking in at 3-4psi or less error.

 

[Marky Dissod]

Did you use a strobe? That is calibrated with a calibrated frequency counter? What percentage was it calibrated to? You see where im going here?
I use to be an electronic tech in the industrial field that performed calibration of instrumentation and sensors.
It gets really expensive the tighter the tolerances of calibration are calibrated to. The equipment to perform the work can get very expensive.

But again we are just dealing with 30-40psi and 10% error really isnt that big of a deal clocking in at 3-4psi or less error.

No, my tuner used HPTuner's scanner. I totally get what you're saying about things being calibrated to fine tolerances.

My ASSumption is that the margin of error of everything between the crank sensor and the pcm is +or-25RpM ...
and somewhere between the pcm and the tach needle, the lower margin of error swells to ≈300RpM.
(So far as we could tell, the needle never overestimated, by the way.)

Points I were trying to make prior:
can't JUST look at a 2 decade old mechanical dashboard gauge and assume it is accurately measuring, much less representing,
the actual oil pressure at that point of measurement, without at least one other measurement to compare it against.

 

[BMPNUGLS]

Before trying any ‘home brew’ flush or additive to the oil I would use the new Valvoline Restore & Protect oil for 3-4 oil changes. Do some investigating, but it’s got a ton of real world results cleaning up the internals of the engine…and I’m on my 4th oil change with it and the engine seems to run better every OC! AND it has improved my idle and under power oil pressure by 5-10psi.

Worth a try…especially if your a Valvoline fan.

 

[nonickatall]

Good oil is always good for the engine, but I saw the diesel thing in the YouTube video and was skeptical too.

So I checked my oil before the interval and it was like honey. I put in a liter of diesel and drove about 20 kilometers.

When I did the oil change, the oil was dark black, so the diesel dissolved a lot of carbon after 20 km.

I only use good oil, but I've learned to appreciate the diesel thing.