After this months newsletter, just changed my Mobil1 Filter to Bosch - ZR-1 Net Registry Forums

Corvette95 · 11-05-2006

Had a brand new Mobil 1 black extended life filter on my 95, after reading Haibecks article I just swapped it with a Bosch 3401 , has anyone tested the Fram PH3985 or the STP S3985 . I also wonder if the extened life Mobile 1 performs any better than the standard Mobil 1 ?

jonszr1 · 11-05-2006

I was wondering about the Napa gold also. I heard it was a wix filter and had excellent holding of pressure?Are there any of the high end reusable filters that would be better?

bobbyhi · 11-05-2006

I don't know if Marc tested every oil filter available but if he says to use the Bosch that is what to go with. Can't go wrong with Marc's recommendations.............

Aurora40 · 11-06-2006

I'll probably be picking up Bosch in the future as well. Though I'm not so concerned as to go remove the filter on there now to swap it out.

Hammer · 11-06-2006

Quote:

Originally Posted by Corvette95

Had a brand new Mobil 1 black extended life filter on my 95, after reading Haibecks article I just swapped it with a Bosch 3401 , has anyone tested the Fram PH3985 or the STP S3985 . I also wonder if the extened life Mobile 1 performs any better than the standard Mobil 1 ?

Autozone Bosch filters are $5.99 and usually in stock.

tf95ZR1 · 11-07-2006

Quote:

Originally Posted by Corvette95

Had a brand new Mobil 1 black extended life filter on my 95, after reading Haibecks article I just swapped it with a Bosch 3401 , has anyone tested the Fram PH3985 or the STP S3985 . I also wonder if the extened life Mobile 1 performs any better than the standard Mobil 1 ?

Am I reading the wrong article? Marc's article says the FRAM,
not Mobil 1 filters drain back valve malfunctions. I think either
Mobil 1 or Bosch are OK.
Ted

To quote Marc Haibeck
"As published, in 1997

It May Be Time For More Than Just A Simple Filter Replacement

See the note at the end of this article for the latest filter recommendation dated June 2005

I have discovered that there is a defect in the design of the PF970C oil filter. The anti drain back feature does not function properly.

June 2005

Fram no longer markets the TG3905 filter in the Chicago area. A good filter that is available in this area and works correctly is the Bosch 3401. Auto Zone parts stores stock the Bosch 3401. A plus feature of the 3401 is that it is colored gloss black like the PF970C.

The Mobil 1, M1-207 is also a good choice. The anti drain back valve seals normally. The filter is white in color. Serious LT5 owners will want to paint it black. It is rather expensive. It's available at Auto Zone stores."

Hammer · 11-07-2006

Hi Ted,
Pages 19 and 20 of the current (10/06) Heart of the Beast newsletter has some updated testing by Marc. It reads as follows:

The Bosch Premium 3401 oil filter is a good choice for the LT5. The anti-drainback valve works very well and it has filtration and flow characteristics that are compatible with the PF970C. The manufactures provided the following performance specifications for the original PF970C (early filter) and the Bosch 3401. The testing was performed according to SAE specification HS-806. Filter Single pass particle size at 98% efficiency Flow at 3 psi pressure differential

PF970C 25 microns 7 gal./min.
Bosch 3401 20 microns 12 gal./min.

The anti-drainback system performs poorly on the Mobil 1 M1-207 filter.

Anti-Drainback Test Results
The filters were removed from LT5 engines 8 hours after shutdown. The oil to weight ratio is the weight of the retained oil expressed as a percentage of the total weight of the filter and the oil. The testing was performed with Mobil 1 10W-30 oil. Mobil1 10W-30 oil weighs .94 ounce in mass per fluid ounce of volume.

Filter. Weight when new. Weight after 8 hours. Retained oil weight. Oil to weight ratio.
PF970 14oz. 25oz. 11oz. 44%
PF970C early 15oz. 18oz. 3oz. 17%
PF970C late 15oz. 20oz. 5oz. 25%
PF970C blue 14oz. 22oz. 8oz. 36%
Bosch 3401 13oz. 22oz. 9oz. 41%
Mobil 1 207 17oz. 21oz. 4oz. 19%

Recommendations
The old blue PF970 was the best performer in this test. However, it is no longer available from ACDelco. The Bosch 3401 and the blue PF970C filters are about equal with very good anti-drainback

Peaven · 11-07-2006

Time to get rid of the M1's and go with the Bosch or the Blue 970C.

tomtom72 · 11-09-2006

This is proly just "bad luck of the draw" but I recently went thru two M1-207 filters on my 90. Both gave me exceptional chain rattle at start up, even hot start ups were affected and even the gauge was making me think the sensor was going south. They were the black ones, not that I think that matters but I'm not sure it was just "my luck" that I caught two in a row with less than good drain back valves.

I put the bosch on after seeing the threads here and reading the Heart newsletter....man what a difference!

Now she's back to business as usual. Hot starts are quiet again and cold starts are back to the usual (for my car anyway) 3-5 seconds or mostly less of faint rattle and the oil pressure gauge is now showing O/P building like it used to before the last two M1's.

I just say thanks to Marc and the other bro's o' the beast for the "head's up"!

Tom

11-05-2006	#1
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,119	After this months newsletter, just changed my Mobil1 Filter to Bosch Had a brand new Mobil 1 black extended life filter on my 95, after reading Haibecks article I just swapped it with a Bosch 3401 , has anyone tested the Fram PH3985 or the STP S3985 . I also wonder if the extened life Mobile 1 performs any better than the standard Mobil 1 ? __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454

11-05-2006	#2
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,407	Re: After this months newsletter, just changed my Mobil1 Filter to Bosch I was wondering about the Napa gold also. I heard it was a wix filter and had excellent holding of pressure?Are there any of the high end reusable filters that would be better?

11-05-2006	#3
bobbyhi Join Date: Jul 2005 Location: Mendota Heights, MN. 55120 Posts: 984	Re: After this months newsletter, just changed my Mobil1 Filter to Bosch I don't know if Marc tested every oil filter available but if he says to use the Bosch that is what to go with. Can't go wrong with Marc's recommendations............. __________________ Bob Anderson 1990 #2405 White/Gray Haibeck chip,4:09 gears,Power Effects Exhaust,5 spoke chrome,C5 brakes,49th Street rockers,K&N,Hurst,Headers,Upper & lower ported Minnesota State Director Founding Member #19

11-06-2006	#4
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: After this months newsletter, just changed my Mobil1 Filter to Bosch I'll probably be picking up Bosch in the future as well. Though I'm not so concerned as to go remove the filter on there now to swap it out. __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img]

11-07-2006	#7
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,653	Re: After this months newsletter, just changed my Mobil1 Filter to Bosch Hi Ted, Pages 19 and 20 of the current (10/06) Heart of the Beast newsletter has some updated testing by Marc. It reads as follows: The Bosch Premium 3401 oil filter is a good choice for the LT5. The anti-drainback valve works very well and it has filtration and flow characteristics that are compatible with the PF970C. The manufactures provided the following performance specifications for the original PF970C (early filter) and the Bosch 3401. The testing was performed according to SAE specification HS-806. Filter Single pass particle size at 98% efficiency Flow at 3 psi pressure differential PF970C 25 microns 7 gal./min. Bosch 3401 20 microns 12 gal./min. The anti-drainback system performs poorly on the Mobil 1 M1-207 filter. Anti-Drainback Test Results The filters were removed from LT5 engines 8 hours after shutdown. The oil to weight ratio is the weight of the retained oil expressed as a percentage of the total weight of the filter and the oil. The testing was performed with Mobil 1 10W-30 oil. Mobil1 10W-30 oil weighs .94 ounce in mass per fluid ounce of volume. Filter. Weight when new. Weight after 8 hours. Retained oil weight. Oil to weight ratio. PF970 14oz. 25oz. 11oz. 44% PF970C early 15oz. 18oz. 3oz. 17% PF970C late 15oz. 20oz. 5oz. 25% PF970C blue 14oz. 22oz. 8oz. 36% Bosch 3401 13oz. 22oz. 9oz. 41% Mobil 1 207 17oz. 21oz. 4oz. 19% Recommendations The old blue PF970 was the best performer in this test. However, it is no longer available from ACDelco. The Bosch 3401 and the blue PF970C filters are about equal with very good anti-drainback __________________ [I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I]

11-07-2006	#8
Peaven Join Date: Jul 2006 Location: Omaha, NE Posts: 322	Re: After this months newsletter, just changed my Mobil1 Filter to Bosch Time to get rid of the M1's and go with the Bosch or the Blue 970C. __________________ SteveB '94 ABZ Lucky #13-SOLD Last edited by Peaven; 11-08-2006 at 07:48 PM.

11-09-2006	#9
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: After this months newsletter, just changed my Mobil1 Filter to Bosch This is proly just "bad luck of the draw" but I recently went thru two M1-207 filters on my 90. Both gave me exceptional chain rattle at start up, even hot start ups were affected and even the gauge was making me think the sensor was going south. They were the black ones, not that I think that matters but I'm not sure it was just "my luck" that I caught two in a row with less than good drain back valves. I put the bosch on after seeing the threads here and reading the Heart newsletter....man what a difference! Now she's back to business as usual. Hot starts are quiet again and cold starts are back to the usual (for my car anyway) 3-5 seconds or mostly less of faint rattle and the oil pressure gauge is now showing O/P building like it used to before the last two M1's. I just say thanks to Marc and the other bro's o' the beast for the "head's up"! Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member