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Old October 29th, 2025, 09:50 PM
Prowbar Prowbar is offline
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Default Re: '65 GMC 1500 project. From the Netherlands

Well, all that theory is fine and dandy if the filters actually fit...
Read on the forum that there's 2 spin on oil filter housings types (thanks BobBray)

Quote:

Now time for some trivia- some late production spin-on oil filter housings were slightly larger in diameter and took a Chevy style filter (PF35) instead of the Buick/Pontiac/Olds (PF24) type. Extra points if you score one of those!
My oil filter adapter is the smaller PF24 style. This takes the Wix 51049 filter with the small gasket size. The PF24 filter is outdated now.

The PF35 style adapter takes all the filters I bought

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Notice the difference in gasket diameters.



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Anyway, I've ordered new filters and an oil filter cutter to inspect them after use.

These are the filters I'll be using.
Wix 51049 - known and loved

Fram Extra Guard PH11 - turns out these actually have excellent filtration (99% @ 20 microns)

AC Delco PF61E - this filter should fit my adapter. Its a smaller diameter filter with the right 13/16-16 thread.

BOSCH 0 451 104 026 - has an anti drainback valve

MAHLE OC 103 - has an anti drainback valve as well.

After all the reading I've done it basically boils down to this:
To make an engine last, you should:

Avoid excessive cold starts and short trips - most engine wear occurs during the warm up phase - less starts and warm up cycles = less wear. Short trips = bad for cylinder walls and engine oil.

Never beat on a cold engine, let it warm up. Drive gently and avoid high load until at operating temp.

Load = wear - at any temp.

Make sure the engine is well maintained. Right oil at right level, periodic oil and filter changes. Fuel system is right. PCV works right.
Oil filters get worse when they age, air filters get improve when they age (until a certain point).

It is sure easy to lose yourself in heated internet debates about the most minute things.

Can't say my engineering mind will approve of any oil filter that lets a bigger particle size than 30 microns pass - the Baldwin B9 for example (fits the PF24 style) has an absolute rating of 40 microns - don't need a rock catcher, but an actual oil filter please. Will that filter make an engine last - probably so, and you'll never notice a difference in engine performance.

Your thoughts?
Attached Images
File Type: jpg Oil filter comparison.jpg (227.7 KB, Multiple views, 29 clicks)
File Type: jpg Wix 51049 fitment.jpg (151.0 KB, Multiple views, 27 clicks)
File Type: jpg AC Delco PF1218 fitment.jpg (139.9 KB, Multiple views, 27 clicks)
File Type: jpg Baldwin B1428 fitment.jpg (197.9 KB, Multiple views, 28 clicks)

Last edited by Prowbar; October 29th, 2025 at 10:01 PM.
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