So here's the result of my last oil change. I have used the OEM blue Subaru oil filter and Mobil 1 EP 5W30 SN. This oil have seen some pretty extreme service ranging from >110F desert and
As mentioned in the comments, sample dated 10/23/11 is a sample taken at the halfway point so that we can get a rough trend on how the oil performed. What do you guys think of the results?
Quote:
Comments:
This oil wasn't changed out at the last sample, and it held up quite nicely with 7,500+ miles on it. Your
WRX's engine put much less wear in the oil (per mile) during the second half of the oil change interval. The TBN came
back at 3.6, showing plenty of active additive remaining to go even longer. The TAN was 5.0, showing that the oil had
become a little acidic though, so it may be a good idea to stick with about 7,500 miles in the future. The slightly low
viscosity isn't cause for concern. This engine is in good shape and this oil is working well for you.
Code:
Miles on Oil ---------- 7,538 -------- 3,813 -------- 3,744 ----- 2,718 Universal
Miles on Unit 15,040 11,315 7,502 3,758 Averages
Sample Date 02/04/12 10/23/11 07/23/11 03/12/11
Make Up Oil added ---- 0.75Qt ---------- 0Qt ---------- 0Qt ------- 0Qt
Aluminum ------------------ 5 ------------ 4 ------------ 4 --------- 5 ----------- 4
Chromium 1 1 1 0 1
Iron 16 10 17 13 9
Copper -------------------- 8 ------------ 8 ------------ 8 --------- 7 ----------- 8
Lead 0 0 0 0 4
Tin 0 0 0 5 1
Molybdenum --------------- 64 ----------- 78 ---------- 109 ------- 247 ---------- 74
Nickel 1 1 0 0 0
Manganese 0 0 0 1 1
Silver -------------------- 0 ------------ 0 ------------ 0 --------- 0 ----------- 0
Titanium 2 3 3 0 0
Potassium 5 1 2 0 2
Boron -------------------- 34 ----------- 51 ----------- 62 -------- 21 ---------- 48
Silicon 8 8 10 18 11
Sodium 31 37 38 2 27
Calcium ---------------- 1155 --------- 1163 --------- 2678 ------ 2186 -------- 2083
Magnesium 639 608 19 11 305
Phosphorus 660 667 789 706 783
Zinc -------------------- 786 ---------- 774 ---------- 936 ------- 741 --------- 932
Barium 0 0 0 0 0
SUS Viscosity @ 210F --- 55.2 --------- 56.6 --------- 56.4 ------ 53.9
cSt Viscosity @ 100C 8.83 9.23 9.19 8.46
Flashpoint in F 405 395 385 400
Fuel % -----------------
Antifreeze % 0.0 0.0 ? 0.0
Water % 0.0 0.0 0.0 0.0
Insolubles % ------------ 0.3 ---------- 0.4 ---------- 0.2 ------- 0.2
TBN 3.6
TAN 5.0
ISO Code M1EP 5W30SN M1EP 5W30SN M1EP 5W30SM MbilCln 5000 5w30SM
As mentioned in the comments, sample dated 10/23/11 is a sample taken at the halfway point so that we can get a rough trend on how the oil performed. What do you guys think of the results?
Quote:
Comments:
This oil wasn't changed out at the last sample, and it held up quite nicely with 7,500+ miles on it. Your
WRX's engine put much less wear in the oil (per mile) during the second half of the oil change interval. The TBN came
back at 3.6, showing plenty of active additive remaining to go even longer. The TAN was 5.0, showing that the oil had
become a little acidic though, so it may be a good idea to stick with about 7,500 miles in the future. The slightly low
viscosity isn't cause for concern. This engine is in good shape and this oil is working well for you.
Code:
Miles on Oil ---------- 7,538 -------- 3,813 -------- 3,744 ----- 2,718 Universal
Miles on Unit 15,040 11,315 7,502 3,758 Averages
Sample Date 02/04/12 10/23/11 07/23/11 03/12/11
Make Up Oil added ---- 0.75Qt ---------- 0Qt ---------- 0Qt ------- 0Qt
Aluminum ------------------ 5 ------------ 4 ------------ 4 --------- 5 ----------- 4
Chromium 1 1 1 0 1
Iron 16 10 17 13 9
Copper -------------------- 8 ------------ 8 ------------ 8 --------- 7 ----------- 8
Lead 0 0 0 0 4
Tin 0 0 0 5 1
Molybdenum --------------- 64 ----------- 78 ---------- 109 ------- 247 ---------- 74
Nickel 1 1 0 0 0
Manganese 0 0 0 1 1
Silver -------------------- 0 ------------ 0 ------------ 0 --------- 0 ----------- 0
Titanium 2 3 3 0 0
Potassium 5 1 2 0 2
Boron -------------------- 34 ----------- 51 ----------- 62 -------- 21 ---------- 48
Silicon 8 8 10 18 11
Sodium 31 37 38 2 27
Calcium ---------------- 1155 --------- 1163 --------- 2678 ------ 2186 -------- 2083
Magnesium 639 608 19 11 305
Phosphorus 660 667 789 706 783
Zinc -------------------- 786 ---------- 774 ---------- 936 ------- 741 --------- 932
Barium 0 0 0 0 0
SUS Viscosity @ 210F --- 55.2 --------- 56.6 --------- 56.4 ------ 53.9
cSt Viscosity @ 100C 8.83 9.23 9.19 8.46
Flashpoint in F 405 395 385 400
Fuel % -----------------
Antifreeze % 0.0 0.0 ? 0.0
Water % 0.0 0.0 0.0 0.0
Insolubles % ------------ 0.3 ---------- 0.4 ---------- 0.2 ------- 0.2
TBN 3.6
TAN 5.0
ISO Code M1EP 5W30SN M1EP 5W30SN M1EP 5W30SM MbilCln 5000 5w30SM
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