For reference, here is my previous UOA post:
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4018614/Castrol_GTX_Synblend_5w20_6k_m
This sample included a mix of 5w30 and 5w20 Castrol GTX synblend with a very little bit of left over M1 0w40. So as expected it was effectively a 5w30 fill. As several members forecasted, wear numbers actually went down as miles (8k) and overall time (8.5 months) went up vs previous OCI. So pretty clear that for this engine GTX synblend in 5w30 is a pretty good way to go in terms of wear. Given that in 5w20 flavor, PEAK conventional and Castrol GTX synblend performed about the same, I'm sure other quality conventional or synblend oils would do have done great too!
Additional note... Fuel economy went down a bit with this oil. Maybe 1 mpg? Maybe 1/2 mpg. Not too bad.
Code:
Mls on unit 69,500 74,700 80,600 88,500
Mls on oil 6,000 5,200 5,900 7,900
Sample date 1/1/15 7/2/15 2/12/16 10/27/16
Aluminum 2 5 5 4
Chromium 0 2 1 0
Iron 8 9 12 10
Copper 0 0 2 0
Lead 0 0 0 0
Tin 0 0 0 0
Nickel 0 1 0 0
Silver 0 0 0 0
Molybdenum 62 21 6 7
Titanium 0 0 0 0
Calcium 1173 1579 1908 1917
Magnesium 618 216 45 18
Phosphorus 897 788 641 599
Zinc 993 910 732 685
Barium 0 0 0 0
Boron 72 18 25 30
Sodium 93 269 108 65
Silicon 9 11 11 14
Potassium 2 5 0 3
PROPERTIES
cSt Viscosity 8.72 8.30 7.90 9.80
Coolant 0% 0% 0% 0%
Water (%) 0% 0% 0% 0%
TBN N/A 3.7 3.2 N/A
https://bobistheoilguy.com/forums/ubbthreads.php/topics/4018614/Castrol_GTX_Synblend_5w20_6k_m
This sample included a mix of 5w30 and 5w20 Castrol GTX synblend with a very little bit of left over M1 0w40. So as expected it was effectively a 5w30 fill. As several members forecasted, wear numbers actually went down as miles (8k) and overall time (8.5 months) went up vs previous OCI. So pretty clear that for this engine GTX synblend in 5w30 is a pretty good way to go in terms of wear. Given that in 5w20 flavor, PEAK conventional and Castrol GTX synblend performed about the same, I'm sure other quality conventional or synblend oils would do have done great too!
Additional note... Fuel economy went down a bit with this oil. Maybe 1 mpg? Maybe 1/2 mpg. Not too bad.
Code:
Mls on unit 69,500 74,700 80,600 88,500
Mls on oil 6,000 5,200 5,900 7,900
Sample date 1/1/15 7/2/15 2/12/16 10/27/16
Aluminum 2 5 5 4
Chromium 0 2 1 0
Iron 8 9 12 10
Copper 0 0 2 0
Lead 0 0 0 0
Tin 0 0 0 0
Nickel 0 1 0 0
Silver 0 0 0 0
Molybdenum 62 21 6 7
Titanium 0 0 0 0
Calcium 1173 1579 1908 1917
Magnesium 618 216 45 18
Phosphorus 897 788 641 599
Zinc 993 910 732 685
Barium 0 0 0 0
Boron 72 18 25 30
Sodium 93 269 108 65
Silicon 9 11 11 14
Potassium 2 5 0 3
PROPERTIES
cSt Viscosity 8.72 8.30 7.90 9.80
Coolant 0% 0% 0% 0%
Water (%) 0% 0% 0% 0%
TBN N/A 3.7 3.2 N/A