Oil consumption? Please chime in

[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.

[Tcoat]

Originally Posted by 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.

Are you going to resurrect every 5 year old thread to say this?

[humfrz]

Originally Posted by Tcoat

Are you going to resurrect every 5 year old thread to say this?

His last sentence explained a lot -


humfrz

[NoHaveMSG]

Originally Posted by Tcoat

Are you going to resurrect every 5 year old thread to say this?

Multiple threads apparently. All 8 posts are the exact same thing on different threads.

[HKz]

ROGER-86, the underdog amateur engineer vs the welterweight Toyota/Subaru engineers




place your bets everyone!!

[NoHaveMSG]

Didn't @Tcoat just post about it being national stupid question day?

[Tcoat]

Originally Posted by NoHaveMSG

Didn't @Tcoat just post about it being national stupid question day?

This dude thinks it is National Stupid Answer for a Question Nobody Asked day!
My bet's are on second year engineering student that know a whole pile about nothing but will save the world with that knowledge. I have seen hundreds of them.

[HKz]

now that I think about it, how can we really trust a guy proclaiming himself to be an engineer all about measuring things on his own but he has to rely on a computer to shift his gears? psh, wannabe car nerd

[Tcoat]

Originally Posted by HKz

now that I think about it, how can we really trust a guy proclaiming himself to be an engineer all about measuring things on his own but he has to rely on a computer to shift his gears? psh, wannabe car nerd

Not to mention topping up their oil at 12,400 miles when the service interval is 7,500 miles.

[Icecreamtruk]

Nobody gonna mention that coolant consumption? I'll have my popcorn ready for his blown head gastket thread.

[Tcoat]

Originally Posted by Icecreamtruk

Nobody gonna mention that coolant consumption? I'll have my popcorn ready for his blown head gastket thread.

At 3.7 oz? Not even enough to mention. Loose that the evaporation in the overflow in that many miles.

[Lantanafrs2]

Coolant consumption put me in the hospital

[strat61caster]

Originally Posted by Tcoat

This dude thinks it is National Stupid Answer for a Question Nobody Asked day!
My bet's are on second year engineering student that know a whole pile about nothing but will save the world with that knowledge. I have seen hundreds of them.

I'm triggered.

[Lantanafrs2]

How about a discussion on header design