Quote:
Originally Posted by MetroMPG
jjf - thanks for the oil info. Seems to me that if one is going to extended change intervals with synth, regularly scheduled filter changes might address the issue, no?
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Partially. It removes particulates, but not any leaching contaminates. Most the newer synthetics actually address this chemically, but some of the older ones do not.
I guess the science would be, synthetic oil + regular filter changes is very reasonable. On the far more subjective front, I'm a regular oil change guy. I don't have controlled data to back it up, but I know I got 100K out of vehicles when it was rare, consistently get 250K-300K now, and have taken a number of light aircraft engines far beyond recommended TBO.
Interestedly, the only time I didn't get great engine life between rebuilds was my first experience with synthetic oil in aircraft usage, but everyone had that problem, so it was a rebuild I didn't have to pay for!
Quote:
Originally Posted by MetroMPG
I can confirm that the SG reports loop status directly from the ECU; it's not inferred from other sensor readings.
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I didn't think it did, though if it has just has one indicator, I presume it combines the multiple indicator bits from the PID.
Quote:
Originally Posted by MetroMPG
And I agree, puddleglum: some cars go to closed loop really quickly, even in sub-sub-zero  conditions. My Firefly does; but others have reported longer transition times. |
See my post above, it is still a good indicator of when the ECU thinks that head temps and the flame front are in normal operating range.
Quote:
Originally Posted by MetroMPG
I do sometimes monitor it when pulsing at high load to prevent going into fuel enrichment).
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A good idea.
-jjf