Got my first oil analysis from Blackstone labs. Oil was almost 2 yrs old and in that time I put 13,000 miles on the car.
Car was driven probably half highway with my cross country trip from NY to Vegas and back. And half hard NYC miles, with mostly short trips under a few miles each way. Car was stored for 3 months and 2 months during the two years.
I only added oil during the last month of the 2 years as I noticed I was below the low level. Added about .3 to .5 quarts.
During this time I did notice that one of my air filter clamps opened up and the air filter housing was open a bit, not sure what this could have done.
The only issue I see is high Sodium. This may have been from the prior oil change (not sure what was put in the car before I owned it) as I did not level the car when removing the oil which probably left over .5 quarts. It could also be because of the air filter housing coming loose and living near the ocean in NYC??
I used to do 3500 mile oil changes years ago but when I realized that was a scam I only do extended oil changes. I aim for changing the oil every two years and I wouldn't care if I had as much as 24,000 miles in that time.
From almost every oil analysis report I read it seems that oil can last many years and many thousands of miles.
Oil used was 0w20 amsoil signature series with amsoil oil filter.
Car has 165,000 miles.
Hard to line up columns because forum deletes spaces.
--- My OIL --- Universal Averages at 8,400 miles
ALUMINUM --- 8 --- 5
CHROMIUM --- 1 --- 0
IRON --- 22 --- 12
COPPER --- 15 --- 9
LEAD --- 0 --- 1
TIN --- 0 --- 1
MOLYBDENUM --- 113 --- 159
NICKEL --- 1 --- 0
MANGANESE --- 0 --- 0
SILVER --- 0 --- 0
TITANIUM --- 0 --- 0
POTASSIUM --- 0 --- 1
BORON --- 48 --- 64
SILICON --- 18 --- 12
SODIUM --- 109 --- 22
CALCIUM --- 3446 --- 2214
MAGNESIUM --- 36 --- 127
PHOSPHORUS --- 673 --- 710
ZINC --- 802 --- 859
BARIUM --- 0 --- 0
------------ MY VALUES ------ SHOULD BE VALUES
SUS Viscosity @ 210°F --- 56.8 --- 46-57
cSt Viscosity @ 100°C --- 9.3 --- 6.0-9.7
Flashpoint in °F --- 395 --- >385
Fuel % --- <0.5 --- <2.0
Antifreeze % --- ? --- 0.0
Water % --- 0.0 --- <0.1
Insolubles % --- .3 --- <0.6
TBN --- 1.8 --- >1.0
BLACKSTONE COMMENTS
Thanks for the note about the oil you added. Was that the same brand of Amsoil SSO that was already in the sump? Amsoil typically doesn't use sodium as additive, so the sodium here could have been additive from another type of oil. If not, this could show coolant, but we see no other signs of that. Silicon might be dirt, so check air filtration. Metals look good for your long oil run (averages are based on ~8,400 miles of oil use) and the TBN is fine at 1.8. As long as the air filter is clean and you're not losing coolant,
two-year intervals look okay. Try 15,000 miles next oil.