Shocked me when I saw on my service paper from my last oil change at dealer they filled with 0w20, they said probably a typo. However, just got a blackstone UOA back that showed cSt Viscosity @ 100°C 8.20, meaning the dealer did indeed use BMW 0w20 in my BMW M4 that originally came with 5w30 / 0w40 LL01 (basically minimum 3.5 HTHS). Blackstone states that the wear was fine but I'm pretty sure that these UOA don't tell the full story when it comes to wear. I only had the oil in the car for 1450 miles across 8 months (mostly short 15-20 mile trips on highway each time, but oil temps alway reached 215-230f each trip). The UOA shows titanium because the previous fill was Castrol EDGE 0W30 FST. What metals would show up if bearings were wearing faster? I'm concerned that running 0w20 LL14FE in a motor that called for a much heavier weight (LL01 5w30 / 0w40) would have wear issues.
Blackstone report(1450 miles, 8 months run on BMW 0w20 TPT)
ALUMINUM
4
CHROMIUM
0
IRON
4
COPPER
1
LEAD
0
TIN
0
MOLYBDENUM
52
NICKEL
0
MANGANESE
0
SILVER
0
TITANIUM
9
POTASSIUM
0
BORON
87
SILICON
3
SODIUM
3
CALCIUM
1777
MAGNESIUM
29
PHOSPHORUS
672
ZINC
724
BARIUM
0
SUS Viscosity @ 210°F
53.1
cSt Viscosity @ 100°C
8.20
Flashpoint in °F
390
Fuel %
Antifreeze %
0.0
Water %
0.0
Insolubles %
0.1
Blackstone report(1450 miles, 8 months run on BMW 0w20 TPT)
ALUMINUM
4
CHROMIUM
0
IRON
4
COPPER
1
LEAD
0
TIN
0
MOLYBDENUM
52
NICKEL
0
MANGANESE
0
SILVER
0
TITANIUM
9
POTASSIUM
0
BORON
87
SILICON
3
SODIUM
3
CALCIUM
1777
MAGNESIUM
29
PHOSPHORUS
672
ZINC
724
BARIUM
0
SUS Viscosity @ 210°F
53.1
cSt Viscosity @ 100°C
8.20
Flashpoint in °F
390
Fuel %
Antifreeze %
0.0
Water %
0.0
Insolubles %
0.1
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