Anyone know of any locations in the Detroit area where I can purchase the Mercury 25W-40 oil and filters for my 525's. Really tired of paying the crazy prices they charge at the local marine store here. Going to stock up for a few changes.

Wal-Mart usually sells the filters.

Or the Mobil 1 filter - Mobil 1: M1-302 or M1-111

Our local Wal Mart has the Mercury 25-40 on the shelf.

Have you tried the 25W-40 synthetic blend or the 20W-40 full synthetic for your 525's? Why or why not?

For Mercury/Quicksilver brand oil, I go to http://www.michiganmotorz.com/ They are in Troy.
They had the special oil for the new Catalysed engines, which I have. Nobody else carried it, like West Marine, etc.

use wix filter 51060R,,,and i have been using valvoline motorcycle oil 20W-50,,with no problems,,

I think Wal Mart has gotten the Mobil 1 syn 20W 50 back in the 5 qt jugs for $27 if you want great oil for a good price.

Walmart...

Were are you getting it

Auto value parts store