Are these two pumps actually different?

The specs that overlap match: 100W, 12V and up to 4 L/min. Only the self-priming listing publishes hose sizes, housing material and a 30-minute work cycle, so treat them as the same pump with different listing detail.

Which is better for changing engine oil?

Either works. The self-priming listing is the safer buy because it states 6 mm and 8 mm inlet hoses, so you can check the tube fits your dipstick before ordering.

Can either pump move diesel?

The extractor listing names diesel fluid transfer in its title. The self-priming listing only mentions engine oil, so if diesel is the main job, pick the extractor listing.

How long can I run it at once?

The self-priming listing gives a 30-minute work cycle. The extractor listing gives none, so keep runs short and let the motor cool.

Is one worth the extra money?

No extra is involved. Both are $45.99 at Amazon as of November 3, 2026, so pick on the published specs, not price.

Will it fit my car's dipstick tube?

The self-priming listing includes 6 mm and 8 mm inlet hoses, which covers most dipstick tubes. The extractor listing does not state hose sizes.

NORJIN 12V 100W Electric Oil Extractor Pump with Tubes, Diesel Fluid Transfer Pump for Car, Marine, RV, Boat, Motorcycle vs NORJIN 12V 100W Self-Priming Engine Oil Pump

These are the same pump sold under two NORJIN listings, and both cost $45.99 at Amazon as of November 3, 2026. Buy whichever listing shows the hose sizes you need, since only the self-priming listing states them. Neither is a better pump than the other; the choice comes down to the listing details and stock.

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