Best IO-360 A1A oil consumption

[SLOWR426]

What is the best (least) oil consumption rates you guys have ever seen with your IO-360 A1A’s? (Hours per quart?)

[takair]

Best I have seen was just under 10hr/qt shortly after break in with new jugs.  Worst was about 4hr/qt with ring delamination.  It now seems closer to 8hr/qt and gets a little worse as the oil goes past 30 hours.  I can’t explain that part.  If I start with 8 qts, The dipstick indicates about 1/2 qt low rather rapidly, but then settles to the normal rate.  If I start at 7 it does marginally better.  Never went below 5 so I don’t know if there is a point where it levels off.  Some folks say they never add oil between changes, I think it is important to ask…..at how many hours do you change oil and how much is left prior to changing?  
 

[N201MKTurbo]

My engine (and IO-360 A3B6D), which was a factory reman, would use less than quart between oil changes. It was less than 1 QT/25 hours. Considering how much it leaked, it must have burned no oil. My rebuilt engine with Continental cylinders has very low consumption too, but I don't know exactly how much.

[BrianWilkins]

Best I've seen with mine was about a quart in 9 hours.  Worst was a quart in 4 just prior to overhaul.  "Normal" for me seems to be about a quart in 6.5 to 7, keeping it at 6 quarts all the time.

[BobbyH]

My IO-360-A1A uses around 1 Quart in 8 hours.  It does have a leak that drips on the nose wheel a little so I'm assuming very little is passing the rings. 

[Shadrach]

I don't really track oil consumption to the hour. The utility of the information is greatly over stated as most do not control for all of the different variables. Oil usage varies by oil level. If I topped off in such a way as to start every flight with the sump at max capacity (8qts) my usage would be very different from used some other lower target number. Oil puked out the breather can tell you something about cylinder health, but only at the extreme.  Under normal circumstances it is near impossible to determine how much oil departs through the breather vs burned.  One can say the same about compression numbers.  They don't tell you much until the readings get extreme...and even then, it can be an one time anomaly.  

I fill to seven quarts when I change the oil and add a quart when it drops below six quarts  On average, I add about two quarts between 50 hour oil service intervals. It's usually ready for a third quart when it's time to change the oil.  I don't sweat the burn rate, but I do watch for trend changes but it has been consistent throughout the engine's life (to include one OH and an IRAN). 

[M20F]

https://resources.savvyaviation.com/wp-content/uploads/slides_airventure2021/2021-07-26 1300 F7 How Healthy is Your Engine.pdf