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Tech Tip: Larger Oil Filter

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Original Curbster

Joined: 22 Jun 2005
Age: 60
Posts: 8940
Location: TX, USA

1969 Mercury Cougar XR7

PostPosted: Mon Dec 05, 2016 7:30 pm    Post subject: icon_fight Tech Tip: Larger Oil Filter Reply with quote

Here's a quick tip for using a larger oil filter on Ford V8s:
If you currently use the standard FL1-A1 1 quart oil filter, you can also use the larger 'truck' filter that Ford used on the '89 F700 429 truck engine. The FL1-A1 is ~4.75" long the truck filter is ~6.4".
The truck filter has the same bypass valve pressure (8-11 psi) and flows 7-9 gpm but holds roughly 50% (13 oz) more oil.
Manufacturer specs on the FL1-A1 vary between 4 gpm and 7 gpm, but the truck filter is rated at 7 or better for all manufacturers.

Large filter part numbers:

  • Wix 51773
  • NAPA 1773
  • Purolator L40017
  • Fram PH977A
  • Motorcraft FL299
  • FleetGuard LF697

The cost of the larger filter seems to vary from $6 to $11 depending on brand and retailer. The Fleetgaurd name is generally used on heavy trucks and farm equipment and seems to be the best priced. If you have a truck stop / service center near by you may find them there. The more common names can be found at most auto parts stores such as Advanced Auto Parts and NAPA.
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