Latest numbers on the left using Mobil 1 5w30 for 8,414mi and oem oil/air filter, 81,199mi on the car.
Code:
Miles 8414 8369 7512 7579 7534 7490 7382 7666 7247 5339 3305
Oil M1 M1 M1 M1 M1 AMS M1 M1 mix M1
Vis 5w30 10w30 5w30 5w30 10w30 5w30 5w30 5w30 mix 0w30
Aluminum 3 2 2 2 3 2 2 4 5 5 5
Chromium 0 0 0 1 1 0 1 1 1 1 1
Iron 10 8 6 8 10 5 6 9 11 7 8
Copper 3 2 2 2 2 2 3 4 6 6 3
Lead 5 2 2 2 3 1 1 1 2 2 2
Tin 2 0 0 1 0 0 0 0 0 1 0
Molybdenum 82 79 75 65 74 58 26 67 72 71 83
Nickel 1 1 0 0 0 0 0 0 0 0 0
Manganese 0 0 0 0 1 0 1 0 1 1 1
Silver 0 0 0 0 0 0 0 0 0 0 0
Titanium 0 0 0 0 0 0 0 0 0 0 0
Potassium 3 2 0 1 3 1 0 1 1 1 2
Boron 40 43 55 121 120 110 33 112 78 74 152
Silicon 10 11 9 9 10 3 5 6 6 8 8
Sodium 7 8 3 7 11 7 6 9 9 8 9
Calcium 2199 2244 2307 2551 2604 2324 2028 2537 2735 2465 2568
Magnesium 13 12 15 27 181 37 558 24 131 125 33
Phosphorus 612 611 657 697 813 673 832 687 755 784 828
Zinc 729 724 745 792 862 720 990 886 859 921 943
Barium 0 0 0 0 0 0 0 0 0 0 0
Sus Vis 56.7 58.8 59.1 58.3 58.3 60.0 65.4 60.9 62.6 61.2 58.3
FlashPt 350 440 385 410 375 405 390 390 380 395 420
Fuel% 0.8
Antifreeze% 0 0 0 0 0 0 0 0 0 0 0
Water% 0 0 0 0 0 0 0 0 0 0 0
Insolubules% 0.3 0.2 0.3 0.3 0.3 0.2 0.2 0.4 0.4 0.2 0.2
MakeUp (qts) 0.5 0.75 0.75 1 0.5 1 0.5 1.5 1 0 0
TBN 3.2 3.9 3.0 4.7 5.3 4.1
Notice the fuel dilution and small rise in wear metals. This is due to less freeway driving and more short trips on the last half of this UOA. I used the WRX less for my 22mi each way commute, only once or twice a week and my wife used it for shorter trips, running errands, etc.
I would not run the oil any longer than this as I think that if I ran it past 9k miles like Blackstone suggests under these conditions, a couple things would happen. One, the oil would be in the car close to a year with the reduced miles on it. Two, more time spent with slightly fuel diluted oil will increase wear.
I will actually reduce UOA intervals back down to 7.5k mi and see how things go with the new driving habits.
In the sump now is Amsoil ASL 5w30 and a Wix oil filter.
Any comments?
BTW, for commuting I was taking our old '95 Civic (35-38mpg on my commute) that we recently sold and bought a '08 Prius (45-48mpg on my commute). Both are a lot better than the 25-27mpg in the WRX, especially considering that the WRX needs premium fuel! Especially now that my commute has recently extended to 27mi from 22mi. Driving the Prius to work instead of the WRX saves enough money to pay for half of lunch!
Code:
Miles 8414 8369 7512 7579 7534 7490 7382 7666 7247 5339 3305
Oil M1 M1 M1 M1 M1 AMS M1 M1 mix M1
Vis 5w30 10w30 5w30 5w30 10w30 5w30 5w30 5w30 mix 0w30
Aluminum 3 2 2 2 3 2 2 4 5 5 5
Chromium 0 0 0 1 1 0 1 1 1 1 1
Iron 10 8 6 8 10 5 6 9 11 7 8
Copper 3 2 2 2 2 2 3 4 6 6 3
Lead 5 2 2 2 3 1 1 1 2 2 2
Tin 2 0 0 1 0 0 0 0 0 1 0
Molybdenum 82 79 75 65 74 58 26 67 72 71 83
Nickel 1 1 0 0 0 0 0 0 0 0 0
Manganese 0 0 0 0 1 0 1 0 1 1 1
Silver 0 0 0 0 0 0 0 0 0 0 0
Titanium 0 0 0 0 0 0 0 0 0 0 0
Potassium 3 2 0 1 3 1 0 1 1 1 2
Boron 40 43 55 121 120 110 33 112 78 74 152
Silicon 10 11 9 9 10 3 5 6 6 8 8
Sodium 7 8 3 7 11 7 6 9 9 8 9
Calcium 2199 2244 2307 2551 2604 2324 2028 2537 2735 2465 2568
Magnesium 13 12 15 27 181 37 558 24 131 125 33
Phosphorus 612 611 657 697 813 673 832 687 755 784 828
Zinc 729 724 745 792 862 720 990 886 859 921 943
Barium 0 0 0 0 0 0 0 0 0 0 0
Sus Vis 56.7 58.8 59.1 58.3 58.3 60.0 65.4 60.9 62.6 61.2 58.3
FlashPt 350 440 385 410 375 405 390 390 380 395 420
Fuel% 0.8
Antifreeze% 0 0 0 0 0 0 0 0 0 0 0
Water% 0 0 0 0 0 0 0 0 0 0 0
Insolubules% 0.3 0.2 0.3 0.3 0.3 0.2 0.2 0.4 0.4 0.2 0.2
MakeUp (qts) 0.5 0.75 0.75 1 0.5 1 0.5 1.5 1 0 0
TBN 3.2 3.9 3.0 4.7 5.3 4.1
Notice the fuel dilution and small rise in wear metals. This is due to less freeway driving and more short trips on the last half of this UOA. I used the WRX less for my 22mi each way commute, only once or twice a week and my wife used it for shorter trips, running errands, etc.
I would not run the oil any longer than this as I think that if I ran it past 9k miles like Blackstone suggests under these conditions, a couple things would happen. One, the oil would be in the car close to a year with the reduced miles on it. Two, more time spent with slightly fuel diluted oil will increase wear.
I will actually reduce UOA intervals back down to 7.5k mi and see how things go with the new driving habits.
In the sump now is Amsoil ASL 5w30 and a Wix oil filter.
Any comments?
BTW, for commuting I was taking our old '95 Civic (35-38mpg on my commute) that we recently sold and bought a '08 Prius (45-48mpg on my commute). Both are a lot better than the 25-27mpg in the WRX, especially considering that the WRX needs premium fuel! Especially now that my commute has recently extended to 27mi from 22mi. Driving the Prius to work instead of the WRX saves enough money to pay for half of lunch!