oil filter question

I just purchased a 2007 Tahoe with the 5.3 flex-fuel engine. In looking through the owners manual I see that the oil filter is an AC PF48. I have had several vehicles with the 5.3 and 6.0 and all called for the AC PF46. Does anyone know what they changed, or what the difference is in these filters?

I just purchased a 2007 Tahoe with the 5.3 flex-fuel engine. In looking through the owners manual I see that the oil filter is an AC PF48. I have had several vehicles with the 5.3 and 6.0 and all called for the AC PF46. Does anyone know what they changed, or what the difference is in these filters?

the PF 48 is very different..has a relief valve 12-15psi, has special threads M22X1.5, tiny filter for a big engine...GM don't want this engine to last too long...

the PF 46 is larger no relief valve and has 13/16 -16 standard threads..

I would go with the Wix PL 12222 or the mobil 1 M113...wix also good..
no frams !

I just purchased a 2007 Tahoe with the 5.3 flex-fuel engine. In looking through the owners manual I see that the oil filter is an AC PF48. I have had several vehicles with the 5.3 and 6.0 and all called for the AC PF46. Does anyone know what they changed, or what the difference is in these filters?

one other thing . your 2007 engine does not have a bypass valve in it..the PF48 has a built in bypass valve...when first starting the oil is cold the filter bypass allows oil flow...

so I would guess that if somehow you crossthreaded the wrong filter on you would continuously be bypassing the filter..

this is why GM made a special GM thread ...that way it is murphy proof..but not idiot proof !

tiny filter for a big engine...GM don't want this engine to last too long...


on a side note, is the 5.3l flex fuel the same engine as the 5.3l non flex fuel with some computer/electronics tweeking or is the flex fuel engine a totally different design fromt he standard vortec??

Thanks for the info, I'm sure I would have realized half way into my first oil change, that the filters were different. I just sort of dumbed onto it while leafing through the owners manual and wondered what they changed. As far as the flex-fuel, I don't know what they change internally, looks the same outside. My 03 Yukon was flex-fuel and took a different fuel filter. I thought I read somewhere that all GM's from like 98 on are considered flex-fuel compatible.

Thanks for the info, I'm sure I would have realized half way into my first oil change, that the filters were different. I just sort of dumbed onto it while leafing through the owners manual and wondered what they changed. As far as the flex-fuel, I don't know what they change internally, looks the same outside. My 03 Yukon was flex-fuel and took a different fuel filter. I thought I read somewhere that all GM's from like 98 on are considered flex-fuel compatible.

I believe that the engine is the same... what would be different is the computer programing ...the fuel system should be different..possibly the injectors..

on the oil filter you would have on installation of the pf46 found it would not screw on !

this PF48 filter is used on fork trucks...and other auxilary engines.

GM switched to the PF48 on the NEW 2007 body style trucks.the PF46 it used on the OLD body style trucks and back.