0w20 advice needed for Subaru FB25

[IveBeenRued]

Here is my UOA of Amsoil Signature Series 0W-20 in a FB-series motor for a 10K mile interval:

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Vehicle 2012 Subaru Impreza Sport Limited

Engine Subaru FB20 - 2.0L H4

OIL AMSOIL Signature Series 0W-20 (ASM)

TOP-OFF OIL None - No consumption.

FILTER FRAM - XG7317

SUMP CAPACTIY 5.3 QT

MILES IN USE 10K

MILES ON UNIT 87K

SAMPLE TAKEN March 7 2015

LAB: Oil Analyzers Inc.



Wear Metals (ppm):

ALUMINUM 1

CHROMIUM 0

IRON 8

COPPER 1

LEAD 0

TIN 0

CADMIUM 0

SILVER 0

VANADIUM 0

NICKEL 0



Contaminant Metals (ppm):

SILICON 24

SODIUM 9

POTASSIUM 0



Multi-Source Metals (ppm):

TITANIUM 0

MOLYBDENUM 155

ANTIMONY 0

MANGANESE 0

LITHIUM 0

BORON 70



Additive Metals (ppm):

CALCIUM 3428

MAGNESIUM 23

PHOSPHORUS 681

ZINC 770

BARIUM 0



Contaminants:

FUEL DILUTION
SOOT
WATER


Fluid Properties:

cSt @ 100 C 9.0

TBN 3.83

OXIDATION 56 abs/cm

NITRATION 16 abs/0.1mm




Here is a 6.5K mile sample:

Html:
Vehicle 2012 Subaru Impreza Sport Limited

Engine Subaru FB20 - 2.0L H4

OIL AMSOIL Signature Series 0W-20 (ASM)

TOP-OFF OIL None - No consumption.

FILTER Mobil1 M1-104

SUMP CAPACTIY 5.5 QT

MILES IN USE 6.5K

MILES 73.1K

SAMPLE TAKEN 08/18/2014

LAB: Oil Analyzers Inc.



Wear Metals (ppm):

ALUMINUM 0

CHROMIUM 0

IRON 5

COPPER 1

LEAD 1

TIN 0

CADMIUM 0

SILVER 0

VANADIUM 0

NICKEL 0



Contaminant Metals (ppm):

SILICON 25

SODIUM 6

POTASSIUM 0



Multi-Source Metals (ppm):

TITANIUM 0

MOLYBDENUM 157

ANTIMONY 1

MANGANESE 0

LITHIUM 0

BORON 96



Additive Metals (ppm):

CALCIUM 3729

MAGNESIUM 44

PHOSPHORUS 716

ZINC 803

BARIUM 0



Contaminants:

FUEL DILUTION
SOOT
WATER


Fluid Properties:

cSt @ 100 C 9.1

TBN 6.27

OXIDATION 51 abs/cm

NITRATION 11 abs/0.1mm




M1EP is similar to Amsoil Signature Series and you should be able to run it for at least 10K. Just make sure you do a UOA to verify.

 

[FutureDoc]

Originally Posted By: Doublehaul
Ok folks...everyone convinced me in an earlier thread to not run M1MXT 10w40 in this vehicle. I will use that in my wifes Malibu that calls for 5w30 and is out of warranty. My question is this....My 14 Outback calls for 0w20 and changes at 7500 miles. I was at Walmart today and they had M1 and QSUD in that grade at great prices. Is there any 0w20 that should not be trusted at that interval or will they all handle it? QSUD was on sale but i wasn't sure if it would go the distance. My other option is to run 5w20 conventional and drain it at 5000miles. Any thoughts?


Go with a 0w20 and follow the manual. After the warranty, you can use what you want (and at extended drains). Any 0w20 should be fine with the 7,500 interval, even quality store-brand like NAPA (get the sale $3.5/qt if you want, same price as conventional. You really can't use a conventional in the FB without waiving your warranty. I say extended performance oils like Amsoil or M1 EP are wasted on the 7.5OCI. Also, considering the small amount of "sipping" these engines are prone to do, topping off with a 5w30 syn is "in play" according to the manual. Yes, there is vagueness as far as using a heavier weight but not for Syn. "Hot weather" folks, definitely not Mi, might have some consideration... but even then, 0w20 is still more than acceptable. Subarus are typically easy on oil so the interval is not really a issue save for top-off needs.

0w20 + properly spec-ed filter (Wix 57055) = no worries.