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Nuke'em til they glow!
2,451 Posts
Discussion Starter · #1 ·
Since someone else posted info about their AMSOIL oil analysis, I figured I post one of mine.

I also have a report with this oil used to 13,000 miles (I'll have to go find it). This oil should be changed out of the Prelude at about 10,000 miles with a filter change at 5,000. The big issue is that it (like all oils) will thicken and in this case enter the 50w range. The H22A was not designed with 50w oil in mind. However, 40w oil works quite well, and lowers the burning of oil in Preludes that burn a few qts in between the OEM recommend change interval of 7500 miles. (40w oil cuts consumption in half.) As you can see with the oil analysis, there are no problems at all with using 10w40 synthetic oil in a Prelude.

This is AMSOIL 10W40 HPS (High Performance Synthetic) oil.

The filter was an AMSOIL SDF-20 stock sized filter. (Similar to the Mobil 1 and older Bosch fitlers.)

Miles on oil: 6350

1998 Honda Prelude Base Model with an H22A4 engine.

Gerhard: The viscosity of this used oil read higher than normal for a 10w40, but it was still in the SAE 40w range. This is a strong show for this particular 10w40 after 6350 miles use in the engine. Wear read as good as it did in your first sample, reflecting no changes due to the increase in oil use miles. These Honda 2.2L engines wear nicely, as you can see from the Universal average colum. Yours in not the exception and you could consider adding more miles oil use if you are interested. The TBN for the oil was 13.5, plenty strong.

Wear metals (ppm):

Aluminum: 4
Chromium: 1
Iron: 8
Copper: 5
Lead: 2
Tin: 0

[All wear metals were lower than the universal adverages.]

Additives (ppm):

Molybdenum: 0
Nickel: 0
Manganese: 0
Silver: 0
Titanium: 0
Potassium: 0

Air Filtration (ppm):

Boron: 10
Silicon: 6
Sodium: 4

Additional Additives (ppm):

Calcium: 3660
Magnesium: 237
Phosphorus: 936
Zinc: 1096
Barium: 1

Physical Properties:

SUS Viscosity @ 210F: 79.7
Flashpoint (F): 385
Fuel: <0.5% (normal)
Anti-freeze: 0%
Water: 0%
Insoluables: 0.2%

Notes: It interesting to see that the wear properties with this oil were actually better than using 10w30 Mobil 1.

Nuke'em til they glow!
2,451 Posts
Discussion Starter · #2 ·
Information on the various stuff found in oil during an analysis:

Elements: Elements are quantified in the oil at part per million levels (PPM). This list shows the most common sources of the elements in a gasoline or diesel engine oil.

Aluminum: Pistons, bearings, cases (heads & blocks).

Chromium: Rings, a trace element in steel.

Iron: Cylinders, rotating shafts, the valve train, and any steel part sharing the oil.

Copper: Brass or bronze parts, copper bushings, bearings, oil
coolers, also an additive in some gasoline engine oils.

Lead: Bearings.

Tin: Bearings, bronze parts, piston coatings.

Molybdenum: Anti-wear additive, some types of rings.

Nickel: Trace element in steel.

Manganese: Trace element, additive in gasoline.

Silver: Trace element.

Titanium: Trace element.

Potassium: Antifreeze inhibitor, additive in some oil types.

Boron: Detergent/dispersant additive, antifreeze inhibitors.

Silicon: Airborne dirt, sealers, gaskets, antifreeze inhibitors.

Sodium: Antifreeze inhibitors, additive in some gasoline engine oils.

Calcium: Detergent/dispersant additive.

Magnesium: Detergent/dispersant additive.

Phosphorus: Anti-wear additive.

Zinc: Anti-wear additive.

Barium: Detergent/dispersant additive.

Physical properties: Viscosity, flashpoint, % fuel and antifreeze,
% water and insolubles are all measured in gasoline and diesel engine oils.

If fuel is present in an oil, the viscosity and flashpoint will often be lower than what was stated in the A Values.

Insolubles are solid material that is centrifuged out of the oil. They are typically free carbon from the oxidation of the oil itself, along with blow-by past the rings.
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