Mobil 1 5W-30 UOA for Mazda 626

[White Fang]

Oil Analyzers did this analysis on Mobil 1 5W-30 super syn. My car is a Mazda 626 with a 2.0L 4 cyl engine. The oil filter was a Mobil 1.
Time on oil 6 months. Miles on oil 3,735. Miles on car 28,856. City driving 70%, highway 30%.

Iron 20
Chromium 3
Lead 1
Copper 18
Tin 0
Aluminum 6
Nickel 0
Silver 0
Silicon 49
Boron 169
Sodium 19
Magnesium 33
Calcium 3,039
Barium 0
Phosph 1,096
Zinc 1,329
Moly 86
Titanium 0
Vanadium 0
Potassium 0
Fuel VIS@100C 10.27 cSt
Water 0
Glycol Neg
TBN 5.25
Oxid 39.0
Nitr 33.0

I would appreciate comments about this test. Overall I think it looks good. I am unsure how to interpret the TBN, Oxid and Nitr figures. Can anybody help me there? The viscosity looks like it is on the thin side of 30W.
I changed the oil, but if I am interpreting this test right I could go a lot longer than I did. What do you think?
BTW this is my first oil analysis.

 

[buster]

Iron is high, but lead is excellent. TBN shows a lot of life left in the oil. The oil thickend a bit, but nothing abnormal. It's a good report but your Iron is too high for this many miles I would think. Try using a better Oil filter. M1 are very restrictive. I'd go with a K&N filter.

ZDDP is higher then normal too. Does anyone know why we see ZDDP levels in Mobil 1 above 1K sometimes? Thats against API limits.

[ September 18, 2003, 06:27 PM: Message edited by: buster ]

 

[Al]

As Buster mentioned-iron is kind of high. Although your silicon coul be from sealant in your engine-I would check the intake filter and the duct going to the intake. This could be part of the cause of your iron. Actually-I think this viscosity is about what we are seeing for UOA for Mobil 1. The zinc is way up there. What oil was in there before??

 

[White Fang]

The last two oil changes were both Mobil 1 5W-30. The same as this oil. The air filter is a Fram that has about 8,000 miles on it. Thanks for the input.