Chris,
I don't recall ever using oil for more than 5000 miles. I just wouldn't
feel comfortable with it. I only had trouble one time, if I recall
correctly. That was in a 1956 Plymouth V-8, where the dealer-supplied
oil got dirty and the engine failed. This was over 50 years ago, so I
don't recall the specifics except that it left my young family stranded
in rural north Alabama.
As to the water in Avgas, yes, it separates, and most can be drained
during pre-flight. However, the "gotcha" comes if some residual water
gets moved around in the tank during maneuvers and freezes in a fuel
line while at altitude. Things can get awfully quiet.:-(
Jim Nichols
Tullahoma, TN USA
On 11/8/2013 4:35 PM, Chris Barker wrote:
> Jim
>
> Thanks for that. But doesn't the oil remain separated from the water? I
> know that BMW's extended service intervals are not universally trusted,
> though. And I carried out a precautionary intermediate oil change on my car
> at 8,000 miles, reckoning that a young engine would be most likely to need a
> bit of extra TLC to assist in its longevity.
>
> I was watching some of our little Grob aircraft being refuelled today, in the
> pouring rain. I asked an engineer if water ingress wasn't a problem and his
> reply was to the effect that it was minimal and that the water remained
> separated anyway. However, they do check for water content in the fuel every
> day.
>
> I know that that's a different problem, but it made me think of it.
>
> Chris
> On 8 Nov 13, at 19:12, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
>
>> Recently, I have spread 3000 to 4000 miles per year over three vehicles,
>> and felt that service once a year was a good compromise. I hope to
>> downsize to two vehicles soon. Regardless of mileage, oil picks up
>> condensation over time, leading to a gradual reduction of lubrication
>> efficiency and an increase in acidity.
--
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