2000 Ford F150, 5.4L
Initial fill 5 qts. Castrol GTX 5W-20 & 1 qt GC 0W-30 all from quart bottles. Should have been apx. 9.5-9.6 cSt @ 100ºC.
Make-up oil ½ qt GC 0W-30 at apx. 3,000 miles into interval.
3,725 mile oil use interval.
66,030 miles on unit.
Oil in use January 23, 2006 thru April 4, 2006. Mild weather. Temps averaged 40ºF to 60ºF with the occasional 30 or 70.
50%-60% highway miles.
My comments: Don’t know what to think. Changed oil with 50% GTX 5W-20 and 50% GC 0W-30. (Wanted a bit higher viscosity for summer boat towing.) Was hoping to get a longer run on it but I don’t want to risk damage if I do have antifreeze problem. Searched and didn’t see any other GTX 5W-20 analyses, either virgin or used, with this much sodium. Anybody got any ideas?
Initial fill 5 qts. Castrol GTX 5W-20 & 1 qt GC 0W-30 all from quart bottles. Should have been apx. 9.5-9.6 cSt @ 100ºC.
Make-up oil ½ qt GC 0W-30 at apx. 3,000 miles into interval.
3,725 mile oil use interval.
66,030 miles on unit.
Oil in use January 23, 2006 thru April 4, 2006. Mild weather. Temps averaged 40ºF to 60ºF with the occasional 30 or 70.
50%-60% highway miles.
Blackstone’s comments: The main changes in this analysis compared to the last are, the gas we found last sample has disappeared leaving the viscosity in the normal range for a 5W/20, and the sudden appearance of sodium. We strongly suspect the sodium is an additive from this Castrol product rather than from anti-freeze, which is the usual source for it. We did, however, turn up a trace of moisture in the oil. We will watch all this for you but you may want to use a different type oil next sample to watch the sodium. Wear read perfectly (again). The TBN was 2.1 vs 1.6 last sample.code:
This My Univ
Report Avg Avg
Aluminum 2 3 3
Chromium 0 1 1
Iron 5 11 15
Copper 2 5 5
Lead 0 0 1
Tin 0 0 0
Molybdenum 33
Nickel 0 1 1
Manganese 0 1 1
Silver 0 0 0
Titanium 0 0 0
Potassium 1
Boron 10
Silicon 6
Sodium 71
Calcium 1534
Magnesium 31
Phosphorus 607
Zinc 714
Barium 0
SUS @ 210ºF 55.6 (9.05 cSt @ 100ºC if my calculations are correct.)
Flash 395ºF
Fuel
Antifreeze ?
Water TR
Insolubles 0.3
My comments: Don’t know what to think. Changed oil with 50% GTX 5W-20 and 50% GC 0W-30. (Wanted a bit higher viscosity for summer boat towing.) Was hoping to get a longer run on it but I don’t want to risk damage if I do have antifreeze problem. Searched and didn’t see any other GTX 5W-20 analyses, either virgin or used, with this much sodium. Anybody got any ideas?