Measuring oil consumption

[radroach]

Changed oil perhaps a month ago and have done 3000 miles already, after oil change was slightly overfull and couldn't get a perfect reading, but today the oil levels are perfectly between the L and F marks.

By my guess I could be having .5 - 1 qt of oil consumption by 5000 mi OCI, at ~80,000 miles odo.

What kind of consumption are you guys getting?

[Ultramaroon]

I burn about .5qt/4Kmi but I live for the second and third gear pull. No worries, mate.

Remember, the owner's manual specifies some ungodly numbers.

[humfrz]

I have no idea ....... every time I check the oil level in my car ...... it reads different .....


humfrz

[ROGER-86]

I have been carefully tracking my oil consumption on my 2017 86 Automatic by observing how many quarts of Mobil-1 I have gone through topping up over the last 2.5 years and 27K mi. My car uses exactly 1 qt every 12,400 miles.


As an aside: coolant consumption is 3.7oz every 7,500mi service interval.


I was super careful during the break-in period to watch RPM's and vary constantly, and a few strong pulls (torque'y, but not high RPM) to "seat the rings" if that really does happen. The car gets serviced per book at the dealer as it's new.



I drive it only for fun on a 90 mile route mostly on hiway-1 (Calif coast) to my fav hill climb from San Gregorio to Woodside CA. I do the 10 miles in the hills at 4,500-7K RPM quite hard, very fun. The oil temp gets to about 234 deg at it's peak when I reach the peak of the mountain. The water hits 212 at most (ambient air temperature of about 85).



Scenic driving flat along the coast the oil is 196 deg and water is 190.



I also blend my stupid 91 Calif gas in Woodside with 100 oct race gas (the 76 sells it there!) to get 93 oct and watch the ignition timing to confirm it advances properly to get the most power. I use BlueDriver to monitor.


Another aside... Starting in 2017 forward, Subaru stupidly programmed the car to let the battery discharge during acceleration and stops, doing most of the charging while decelerating only. I discovered this when I parked to listen to the radio for an hour and the car would barely crank. They said it's for "economy" B.S.! This will ruin batteries faster. You can force the car to "normal charge" at 14.2V by turning on the running lights (I drive with them all the time now). Also, if you turn the fan on it will hold at 13.3V. But drive normally and watch the voltage drop from an initial 14.4 at start to around 12.1 in just a few minutes. More on this later as I'm working up a big expose.



I'm an Engineer, I like to measure things