Recent Topics
C-4 Corvette
by HM12460
05/27/15 01:51 AM
water-powered car thread from a couple days ago
by BRZED
05/27/15 12:19 AM
$10 off $45 Purchase of Tekton Tools at Amazon.
by SubLGT
05/26/15 11:33 PM
Reset KAM with tuner vs pull fuse vs disconnect ba
by sam369
05/26/15 11:02 PM
Installing Oil Light On 2004 Ford With Idiot Gauge
by crazyoildude
05/26/15 10:57 PM
'04 Venture 3.4 - Dex-Cool issues?
by Number_35
05/26/15 10:03 PM
22" Craftsman side discharge mower garbage find
by Brybo86
05/26/15 10:01 PM
Wheel score
by Toy4x4
05/26/15 09:46 PM
Schaeffer oil's
by Rendezvous
05/26/15 08:36 PM
update on my power pole
by Chris142
05/26/15 08:13 PM
What new AWD car for my mom?
by skyactiv
05/26/15 08:12 PM
Penpoint oilers
by mjoekingz28
05/26/15 08:06 PM
Newest Members
AlvinX, DocT, Dieselmerc, kbronc80, bady
54118 Registered Users
Who's Online
17 registered (dmack2, Hondacity, Garak, 901Memphis, Brad_C, Billbert, 1 invisible), 561 Guests and 102 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
54118 Members
66 Forums
231913 Topics
3717427 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#2391592 - 09/29/11 05:23 PM Mobil 1 301 vs 303 GMC 6.5
onacorner Offline


Registered: 09/29/11
Posts: 2
Loc: MS
Hi Folks, Long time lurker need some advice pls. By accident I put a M1-301 filter instead of the M1-303 filter on my 98 GMC 6.5 diesel. The only difference is that the 301 has a 30 PSI internal bypass valve. All I noticed is a higher steadier OPR on my factory OP guage.

Is this filter ok to keep on the truck? Thanks Guys

Top
#2391596 - 09/29/11 05:27 PM Re: Mobil 1 301 vs 303 GMC 6.5 [Re: onacorner]
d00df00d Offline


Registered: 10/20/05
Posts: 9701
Loc: PA
welcome to BITOG!

30 PSI on the 301; what is it on the 303?
_________________________
2011 Mazda RX-8 R3
Castrol GTX 5w-20

Top
#2391609 - 09/29/11 05:48 PM Re: Mobil 1 301 vs 303 GMC 6.5 [Re: d00df00d]
daman Offline


Registered: 09/23/06
Posts: 10769
Loc: Bad Axe, MI
The 303(stock filter?) should have no bp valve as the bp is in the block on GM engines.

running that 301 would be fine as the block BP would open first if the 30 psi is higher,no sweat run er!!...
_________________________
"Always"....Mobil 1

Current fill: AFE 0w30

Top
#2391620 - 09/29/11 06:06 PM Re: Mobil 1 301 vs 303 GMC 6.5 [Re: daman]
cp3 Offline


Registered: 07/26/06
Posts: 2645
Loc: Kitchener, Ontario, Canada
That's what I thought but I guess it's different for the Duramax. Mobil doesn't list PSI just that they are both bypassed. Wix x-reference for the 303 says 15 psi and for the 301 8-11 psi.
_________________________
Dodge Charger|Pennzoil Platinum 5w20|Mopar MO-744
Pontiac G6 GT|Mobil 1 0w40|Mobil 1 M1-101

Top
#2391640 - 09/29/11 06:24 PM Re: Mobil 1 301 vs 303 GMC 6.5 [Re: onacorner]
cp3 Offline


Registered: 07/26/06
Posts: 2645
Loc: Kitchener, Ontario, Canada
Just cruised through the ACDelco online catalog and they list only PF1218 or PF35L for '98 diesels, neither of which have a bypass. Mobil's catalog says you should be using an M-302 which also has no bypass.
_________________________
Dodge Charger|Pennzoil Platinum 5w20|Mopar MO-744
Pontiac G6 GT|Mobil 1 0w40|Mobil 1 M1-101

Top
#2391651 - 09/29/11 06:41 PM Re: Mobil 1 301 vs 303 GMC 6.5 [Re: onacorner]
onacorner Offline


Registered: 09/29/11
Posts: 2
Loc: MS
Wow so no problems then...nice to know. Is there a spec advantage to use the 302 over the 303?

Do you think the oil preasure increase I am seeing is just due to using fresh RTS and MOS2 additive? It is a modest increase but it does show up on the factory guage.

Thanks for the welcome! I have learned so much from this forum over the years
_________________________
Adam in Gautier MS
USAF Retired Now Building Navy Ships

94 Ford, 97 Dodge, 98 GMC and 86 Mercedes Diesels and one gasoline buick park ave

Top
#2391660 - 09/29/11 06:48 PM Re: Mobil 1 301 vs 303 GMC 6.5 [Re: onacorner]
daman Offline


Registered: 09/23/06
Posts: 10769
Loc: Bad Axe, MI
The oil pressure increase could be just the new oil,i have a 1997 2500 6.5 and she blows some awesome OP,spec wise i hardly doubt there's a big or any difference in the two.

i have yet to find an over sized filter for this application(PF1218) i found one but it has no ADBV,witch IMO would be fine to use as these filters sit vertical.
_________________________
"Always"....Mobil 1

Current fill: AFE 0w30

Top