So I was going thru my invoices today and I came across something interesting. On a few of my oil changes the dealerused GM#89017524(PF48) and on others GM#88984215(PF42).

Is this something I should be concerned about?

I would like to see some consistency as they are the dealership. I have the PF42 on now and have been running Mobile1 since 800 miles(GM#12345885).

Whats the major difference in the filters. Apparently they both fit, Im thinking maybe the length?

TIA
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I might be wrong but is it ac delco pf48?

 

I only use K&N oil filters on my vehicles: HP1017

 

fixed

 

The AC Delco PF48 supercedes the PF42 so no harm no foul.

 

While on the topic, is there a technical reason why the filters are smaller today than they used to be? Better media ??

 

Many reasons:
More efficient filter media is one, less waste (greener) is another and then the smaller capacity filter takes less time to fill with oil on initial start-up after oil/filter change so oil reaches top of engine a nano-second quicker, the smaller size also makes the filter less likely to be damaged (smaller target) by road debris.

 

Still have to fight that manly urge to need a huge filter, as if its bigger it must be better right...lol

 

Well yeah. That's why I use the 350 truck filter (PF35) on my '73.