15010 INDEX of OIL PUMP / Lookup Code 15010 (TEXT VERSION)

Part Number	Description	Year	Trim	Engine	Replaced By
15010-21001	Oil Pump Assy	1979-1983	GL, NON GL	L28E
15010-S8000	Oil Pump Assy FOR OIL COOLER	1980-1983	GL	L28ET. AT	15010-S800A
15010-S800A	Oil Pump Assy FOR OIL COOLER	1980-1983	GL	L28ET. AT
15010-V0300	Oil Pump Assy	1982-1983	GL	L28ET. MT. F5

 
1) Nissan Parts Deal
 
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Virtually any L-series oil pump can be installed on an L series engine.

Also, nearly all L series oil pumps have the same part number, being 15010-21001.

There are two exceptions. The first being 280zxt oil pump being 15010-S8000. This was the first and only change
to an original equipment L series oil pump since the L series intro.

The second exception is the Nissan Motorsports high-pressure oil pump, 15010-A1110.

Now to the "why" in your question.

"The output for standard and competition pumps is 0.49 fluid ounces (14.5 ml) per pump revolution. The output
of the 280zxt oil pump is 0.55 fluid ounces (16.4 ml) per pump revolution.

The higher volume is for the additional oil to the turbo. It was accomplished with 5mm (0.20 in) longer gears or 35mm (1.378 in.) versus 40mm (1.575 in) internally. Externally the turbo oil pumps are unchanged.

High volume and high pressure are for the most demanding applications."

The above excerpt is taken from "How to modify your Datsun/Nissan OHC engine" by Frank Honsowetz

The above information was found on the California Datsun website.