I run the NAPA Gold series on mine. Heard from a few non Fram likers so I to the careful approach.

Use the HP and you will be fine.....Wix better, maybe; but 8 years on blower motors and never a failure with fram hp. I like the radio active orange.

I don't know what qualifies as "good results" in some peoples minds, but I've got two 575SCi's with 450 hours and have always used Mobil 1 and either Wix or Mercruiser filters.

Never used a drop of oil between 25 to 50 hour oil changes.

When I pulled the heads at around 430 hours I could still see crosshatching on the cylinder walls (meaning little if any cylinder wall wear).

Pesky Varmint

Who makes the Mercury Racing filter for the 525? Why not use it?

Good info. I don't know who makes the merc filter but I don't use it because no one stocks it locally. I had to mail order my fuel filter and the part was around $10 but was $30 w/shipping!

+1

I always run Wix filters on my boat engines. However I do run the Fram Extra Guard on my truck and the Mustang. Now that I've read this thread I'll change them over to Wix also. Thanks guys!

I wouldnt put a Fram filter on ANYTHING !!! Always used AC Delco's without a single problem in high horespower motors, and everyday motors. Trying the K&N filter on my warmed up 502 MAG right now. I like the nut welded on the bottom of the filter for removal.

I have used nothing but fram filters in all my vehicles and boats and never had a problem. My daily vehicle is driven 2400 miles per month and never seen an issue. I would like to see some updated tests done on the filters of today

I've never had any problems using Fram HP filters. I would recommend the hp4 for a 525.