[Corky]

Originally Posted by zxspeedspec

So a buddy of mine also partook in the deal, but he went with the M1-113 filters. Well, the lucky son of a bitch actually received M1-113A filters in the mail!

Both mine came as the "A" series filters.. Not that it matters the GM filter is what's being used anyhow...

[Daily1LE]

Just wanted to bump this as AutoZone is doing this same deal again on the new sales ad that started yesterday and goes through May 2nd. Same price, $37.99 for 5 quarts and an STP filter.

One thing I wanted to note. I just got back from AutoZone and I was able to return the STP filters and pick up AC Delco PF64's for only about $1.76 extra per filter. Both filters are $9.99, but because of the oil deal, the STP filters cost about $8.23 each after sale, so when returning and getting the AC Delco's, you just have to pay the difference. I supposed you could go a step further and return the 2 STP filters and only pick up 1 AC Delco and get an extra few bucks back. Doing it that route would put this deal at under $70 for 10 quarts and an AC Delco filter.

[ZPirate]

Originally Posted by Daily1LE

Just wanted to bump this as AutoZone is doing this same deal again on the new sales ad that started yesterday and goes through May 2nd. Same price, $37.99 for 5 quarts and an STP filter.

One thing I wanted to note. I just got back from AutoZone and I was able to return the STP filters and pick up AC Delco PF64's for only about $1.76 extra per filter. Both filters are $9.99, but because of the oil deal, the STP filters cost about $8.23 each after sale, so when returning and getting the AC Delco's, you just have to pay the difference. I supposed you could go a step further and return the 2 STP filters and only pick up 1 AC Delco and get an extra few bucks back. Doing it that route would put this deal at under $70 for 10 quarts and an AC Delco filter.

I returned my Mobil 1 filters for the AC Delco PF64's. Got back $5 a pop after switching them out.

[Daily1LE]

Originally Posted by ZPirate

I returned my Mobil 1 filters for the AC Delco PF64's. Got back $5 a pop after switching them out.

Wow yeah you're right that is an even better deal. Don't forget you did pay $3 extra for the Mobil 1 in comparison to the STP, so your refund is more like $2. Still, that is cheaper than paying extra $1.67 like I did with the STP exchanged for AC Delco. Thanks for sharing.

[zxspeedspec]

Originally Posted by Msquared

As I noted previously, the Mobil 1 filters do not appear to have the correct bypass pressure for our LT engines. GM calls for a bypass-opening pressure of 22psi like a PF64, but I think the M1 filters have a lower opening pressure like a PF48: the M1-113 seems to cross to both the PF64 and PF48, which is not correct: they are physically the same dimensions and will fit, but the PF48 has too low a bypass pressure. The effect is that if you use a M1-113 or PF48 on your LT1 engine, the bypass will be open more often than it should be and oil will circulate without being filtered (it's bypassing the filter element). The PF64 has the proper bypass pressure, and so does the Wix WL10290XP and NAPA FIL 100290, for example. I wouldn't use a filter on our cars that doesn't publish its bypass pressure specs.

That's not necessarily true. The bypass pressure is filter media specific. With the AC Delco filter media it needs a 22 PSI bypass pressure. The M1-113A filter media is a completely different make and therefore would use a different bypass pressure to get the same effect as the AC Delco filter.

[Crushin_LT1]

Originally Posted by zxspeedspec

That's not necessarily true. The bypass pressure is filter media specific. With the AC Delco filter media it needs a 22 PSI bypass pressure. The M1-113A filter media is a completely different make and therefore would use a different bypass pressure to get the same effect as the AC Delco filter.

He is talking about the M1-113 not the M1-113A.

[2004YZFR1]

The Mobile One filter says that is approved for warranty on any car, so i'm sure its fine to use. I've used them on my old Sonoma and it has 223k on it and still going strong. But I've only had the PF 64 on my 1LE so far.

[ZPirate]

What about the PF64F? It's the AC Delco Professional series filter? Does that work. According to Amazon's website it fits the SS.

[ZPirate]

Originally Posted by Crushin_LT1

He is talking about the M1-113 not the M1-113A.

So it's alright to use use the M1-113A on the LT1 engine?

[Crushin_LT1]

Originally Posted by ZPirate

So it's alright to use use the M1-113A on the LT1 engine?

I haven't looked at the specs, but if the specs match then I'd say it certainly ought to be.

[Msquared]

Originally Posted by zxspeedspec

That's not necessarily true. The bypass pressure is filter media specific. With the AC Delco filter media it needs a 22 PSI bypass pressure. The M1-113A filter media is a completely different make and therefore would use a different bypass pressure to get the same effect as the AC Delco filter.

No, this is not correct. It's dependent on the engine design, and specifically on tolerances and oil pump design (both flow and pressure). GM has been very clear on this.

It's not clear what the actual differences between the M1-113 and M1-113a are. According to this thread, the 113a still doesn't really meet GM's spec, but you have to call Mobil's tech line or email them and different people get different responses. Everything I see still has the 113a still crossing over to both the PF64 and PF48, which means it doesn't have the correct bypass pressure for a modern LT1. And Mobil 1's own site lists the applications for the 113a and the LT1 isn't included. But regardless, why anyone would use a filter that doesn't publish its bypass spec is beyond me. It's not as if there aren't perfectly good, cheap, and available filters on the market that actually meet the GM spec.

[BlueStreak91]

Originally Posted by BlueStreak91

Is there anything wrong with the Mobil 1 filter? Is the AC Delco better? Or just cheaper?

Six pack of M-113a finally arrived (a week after the quarts that went with them).


So oil changes are covered for a while

[zxspeedspec]

Originally Posted by Msquared

No, this is not correct. It's dependent on the engine design, and specifically on tolerances and oil pump design (both flow and pressure). GM has been very clear on this.

It's not clear what the actual differences between the M1-113 and M1-113a are. According to this thread, the 113a still doesn't really meet GM's spec, but you have to call Mobil's tech line or email them and different people get different responses. Everything I see still has the 113a still crossing over to both the PF64 and PF48, which means it doesn't have the correct bypass pressure for a modern LT1. And Mobil 1's own site lists the applications for the 113a and the LT1 isn't included. But regardless, why anyone would use a filter that doesn't publish its bypass spec is beyond me. It's not as if there aren't perfectly good, cheap, and available filters on the market that actually meet the GM spec.

Your GM bulletin literally proves the point I made. Here's the quote:

Note: Any aftermarket filter must also have an internal bypass valve opening pressure specification, element integrity, filtration performance, media particle trap specification and burst strength that is equivalent to the ACDelco PF64/PF63E filters.

They do not say the aftermarket filter requires a bypass valve of exactly 22 PSI, because that is based on the PF64 filter media. The combination of filter media or filtration performance and media particle trap specific along with the other metrics as a whole need to be equivalent to the performance of the PF64 or greater.

Champion Labs/Mobil 1 has stated that their M1-113A filter does exceed the performance metric of PF64. Just because it doesn't require as high of a bypass valve PSI to achieve that, doesn't mean it's not a better performing filter. That PSI is dependent on the rest of the filter construction.

[Msquared]

Originally Posted by zxspeedspec

Your GM bulletin literally proves the point I made. Here's the quote:

Note: Any aftermarket filter must also have an internal bypass valve opening pressure specification, element integrity, filtration performance, media particle trap specification and burst strength that is equivalent to the ACDelco PF64/PF63E filters.

I mean, it literally says it must have an equivalent opening pressure specification. It can't be any more clear than that. Use what you want: it's your car. But given that both M-113 versions cross to the PF48, that tells you everything you need to know about whether or not they actually fulfill the bulletin's criteria or not. The 113A can have the best filter media in the world, but if the bypass valve is open then that become irrelevant.