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Looking on Advance Auto Parts.com, I found two different AC Delco oil filters for my 93 Seville STS: PF58 (Sequential Fuel Injection) and PF61 (Supercedes PF58). Is there a difference? Which one should I be buying? Just want to make sure I get this right.

Thanks in advance,
Curt
 

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Both will work. Look for PF58.
 

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I just went through this myself. Here's what I found from my Caddy specialist.

The original factory-spec filter for my 4.9L was the PF-45. This was phased out and replaced with a PF-58. The PF-58 is currently being replaced by the PF-61. The basic design and physical size is the same.

In a few months, you will most likely only be finding the PF-61 on the shelves. Dealer parts counter or otherwise.

Hope this helps.
 

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Lance Allison said:
I just went through this myself. Here's what I found from my Caddy specialist.

The original factory-spec filter for my 4.9L was the PF-45. This was phased out and replaced with a PF-58. The PF-58 is currently being replaced by the PF-61. The basic design and physical size is the same.

In a few months, you will most likely only be finding the PF-61 on the shelves. Dealer parts counter or otherwise.

Hope this helps.
I bought a case of pf-58 on line at e bay. pf-58 no longer available at pep boys. the difference is the pf-61 does not have a drain back valve built in to the filter. do not know if it is good or bad but decided to grab a case at a good price. by the way the purolator pure one is a very good filter at a good price. (has drain back valve)
Charlie
 

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GM must have some sort of reason to have changed the spec on the filter. It may make it less of a mess to change the filter on the 4.9 without the valve. When I had a 4.9, I use to let it sit overnight to change the filter because it would empty out and not make a mess when unscrewing it.
 

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GOOD POINT!
I use the same procedure (it is a mess)
Although I do not think GM would change a filter design for that reason. the only reason would be $$$$
Charlie
 

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They probably dropped the valve figuring it's not needed. It's to my understanding that the AC-Delco filters in the stores are made under contract by Champ Filters, so they can't get much cheaper. Only the filters that are on the engine from the factory are real AC filters.

The PF61 is also used on GM 4.2 straight 6's.
 
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