Hi All,

When we did the timing belt on my son's 2002 EJ25 Legacy GT, I believe the oil pump that came out had a cast-in "7" and we put in a new Subaru one that had a cast-in "10".

This EJ18 I'm working on (1995 Impreza L) has enough of a main seal leak that I'd be pulling the oil pump off anyway to replace the seal. The oil pump I took out of that has no number cast in. Is it probably a 7mm?

I think the 10 mm oil pump 15010AA300 will fit the EJ18, and as I understand it, it's a good idea on a higher-mileage engine (190k in this case) to have better oil pressure as the bearings have worn over that mileage. I'm not aware of any oil pressure issues with the car, just an "upgrade" to make it healthier going forward.

Thanks for any advice!

Bry

it will fit.  But there is no need.

Solid adjusters in that EJ18 I believe.

EJ18 is a tough rump roast motor.  That crank won't even be touched by the 115 hp or so it makes.

All the old engines already came with 10's. It wasn't till about 2000 that Subaru started experimenting with small pumps. 

GD

Thanks for the advice!!