For this comparison I tried to keep variables to a minimum. The intervals, weather conditions, and driving conditions were roughly equal. The samples were pulled from the dipstick tube in the same way. The lab, filtration, and gasoline used was the same for both samples.
The most recent sample, the 0w-20, is on the right. Non-zero values from the virgin sample are in parentheses.
Car 2002 Acura RSX
Engine 2-liter 160 hp inline-4 K20A3
Miles on car 29,503
Miles on Sample 6,963
Type of miles driven ~75% city and ~25% freeway
Filtration Comptech/UNI oiled-foam air filter and Mobil 1 M1-110 oil filter
[ September 04, 2003, 12:43 AM: Message edited by: Jay ]
The most recent sample, the 0w-20, is on the right. Non-zero values from the virgin sample are in parentheses.
Car 2002 Acura RSX
Engine 2-liter 160 hp inline-4 K20A3
Miles on car 29,503
Miles on Sample 6,963
Type of miles driven ~75% city and ~25% freeway
Filtration Comptech/UNI oiled-foam air filter and Mobil 1 M1-110 oil filter
I'm really happy with the wear metals this time. I'm less than happy that the lab is still having trouble giving meaningful used TBN values. George Morrison assured me that the oxidation index is well below the change point.code:
oil M1 5w-30 0w-20 (Virgin 0w-20)
interval 7110 mi 6963 mi
'
Iron 11 9 (2)
Chromium 0 0
Lead 0 0
Copper 4 4
Tin 3 3 (2)
Aluminum 11 7 (1)
Nickel 0 0
Silver 0 0
Silicon 15 12 (3)
Boron 156 168 (240)
Sodium 20 19 (17)
Potassium 2 2 (1)
Magnesium 223 68 (35)
Calcium 2644 2734 (2625)
Phosphorus 1174 1203 (1258)
Zinc 1251 1329 (1266)
Molybdenum 99 113 (133)
'
Fuel absent absent
Water
Glycol neg neg
Visc(100*C) 10.5cSt 9.4cSt (8.9)
TBN 2.04 0.10 (10)
Soot
Oxidation 34.00 35.00 (24)
Nitration 13.60 13.10 (7)
[ September 04, 2003, 12:43 AM: Message edited by: Jay ]