A recent UOA from Polaris Labs on my 2015 Honda CRV showed fuel dilution of 5%, or in the panic range. This was after 2,700 miles of mostly highway driving in warm weather using Mobil1 AFE 0w-20. A 400 mile highway trip was completed just a few days before the sample and no short tripping occurred during this interval.
My Honda dealer, which had evidently never seen a UOA before, didn't know what to make of the report but ran a bunch of tests and found nothing. District tech support said in the absence of an actual symptom, no further testing was warranted.
I asked specifically if the dealer had performed a fuel injector leak-down test to see if an injector was leaking after engine shut down. The answer seems to be "no" as the dealer contends any such malfunction would be accompanied by a malfunction or computer evidence of a problem. Does this seem right to anyone? Or would a leaking injector repressurize quickly an not result in a driveability/CEL issue?
And if not a leaking injector, where could this quantity of fuel come from given the low mileage and favorable driving conditions? Lab error is a possibility I suppose, but Polaris says they double checked based on the level. As gasoline and oil stay together when mixed, the fact that it was sampled through the dipstick tube using Polaris equipment shouldn't matter, should it?
There's a temptation to ignore the whole issue (which the dealer surely expects me to do), just drive the car, be happy and forget about future UOAs. But this is BITOG...
Thanks for any thoughts.
My Honda dealer, which had evidently never seen a UOA before, didn't know what to make of the report but ran a bunch of tests and found nothing. District tech support said in the absence of an actual symptom, no further testing was warranted.
I asked specifically if the dealer had performed a fuel injector leak-down test to see if an injector was leaking after engine shut down. The answer seems to be "no" as the dealer contends any such malfunction would be accompanied by a malfunction or computer evidence of a problem. Does this seem right to anyone? Or would a leaking injector repressurize quickly an not result in a driveability/CEL issue?
And if not a leaking injector, where could this quantity of fuel come from given the low mileage and favorable driving conditions? Lab error is a possibility I suppose, but Polaris says they double checked based on the level. As gasoline and oil stay together when mixed, the fact that it was sampled through the dipstick tube using Polaris equipment shouldn't matter, should it?
There's a temptation to ignore the whole issue (which the dealer surely expects me to do), just drive the car, be happy and forget about future UOAs. But this is BITOG...
Thanks for any thoughts.