Oil Change.............Mobil 1?
08-22-2008, 06:05 PM
#92
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08-22-2008, 06:34 PM
#93
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Mobil says very clearly that the 15-50 extended performance (SM) does not have lowered the ZDDP.
http://www.mobiloil.com/USA-English/...otor_Oils.aspx
http://www.mobiloil.com/USA-English/...duct_Guide.pdf
http://www.mobiloil.com/USA-English/...otor_Oils.aspx
http://www.mobiloil.com/USA-English/...duct_Guide.pdf
M1 15-50 EP and it is not easy to find.
Cheers,
Jim
08-22-2008, 06:38 PM
#94
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The documents Bill posted says otherwise.
So what other differences are there?
08-22-2008, 06:57 PM
#95
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One has EP on the bottle and the other doesn't 
At the beginning of the year I read up on all of this and thought I had made a fairly educated decision on what oil to run. Now, government meddling, new data and more confusion, yeah!
J
At the beginning of the year I read up on all of this and thought I had made a fairly educated decision on what oil to run. Now, government meddling, new data and more confusion, yeah!
J
08-23-2008, 12:07 AM
#97
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I can't find non-EP 15w50, never seen it and only recently did I learn it existed, but then, I haven't been to Wal Mart to look.
My GTS engine eats a lot of oil (not sure whether valve seals or just worse than typical breather ingestion) so none of it would be in there anywhere close to 15k miles, I'd rather reduce the cost.
My GTS engine eats a lot of oil (not sure whether valve seals or just worse than typical breather ingestion) so none of it would be in there anywhere close to 15k miles, I'd rather reduce the cost.
08-23-2008, 01:29 AM
#98
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Go back and look at this table:
http://www.mobiloil.com/USA-English/...duct_Guide.pdf
There are two pages. The first shows M1 15W/50. The second page shows M1 15W/50 EP. They have the same {zinc} phosphorus.
It's not clear to me what the difference is between M1 and M1 EP other than Mobil guarantees the EP for 15K mile/1 year oil change intervals.
http://www.mobiloil.com/USA-English/...duct_Guide.pdf
There are two pages. The first shows M1 15W/50. The second page shows M1 15W/50 EP. They have the same {zinc} phosphorus.
It's not clear to me what the difference is between M1 and M1 EP other than Mobil guarantees the EP for 15K mile/1 year oil change intervals.
08-23-2008, 01:50 AM
#100
Former Sponsor
Shane:
The GTS engines use oil because Porsche/Mahle forgot to drill the oil return holes into the pistons. The rings can't deal with the excess oil, thus the engines use oil and the oil reduces the effective octane available, making the GTS engines ping, especially in hot weather. This can be fixed, when the engine gets rebuilt....we've fixed many.
Note that we virtually "cured" this, when we changed a couple of engines over to Torco. I'd sure like to get some more data/testing on this. How about an experiment? I'll send you some Torco and you try it and relay the results?
The GTS engines use oil because Porsche/Mahle forgot to drill the oil return holes into the pistons. The rings can't deal with the excess oil, thus the engines use oil and the oil reduces the effective octane available, making the GTS engines ping, especially in hot weather. This can be fixed, when the engine gets rebuilt....we've fixed many.
Note that we virtually "cured" this, when we changed a couple of engines over to Torco. I'd sure like to get some more data/testing on this. How about an experiment? I'll send you some Torco and you try it and relay the results?
08-23-2008, 04:48 AM
#101
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Originally Posted by bill ball
Hey, how come this thread has not burst into flames yet?:
Originally Posted by Mark Kibort
I think all oils are just fine. Im breaking my stroker in with 10-40 penzoil.
The world is ending as we knew it.
Anyone want to buy my Amsoil?
08-31-2008, 02:05 AM
#102
Burning Brakes
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Greg,I seen somewhere else about the 93 GTS using more oil and later models not as bad.Is this on all GTS 1993-95?
Mark
87 s4
Mark
87 s4
Shane:
The GTS engines use oil because Porsche/Mahle forgot to drill the oil return holes into the pistons. The rings can't deal with the excess oil, thus the engines use oil and the oil reduces the effective octane available, making the GTS engines ping, especially in hot weather. This can be fixed, when the engine gets rebuilt....we've fixed many.
Note that we virtually "cured" this, when we changed a couple of engines over to Torco. I'd sure like to get some more data/testing on this. How about an experiment? I'll send you some Torco and you try it and relay the results?
The GTS engines use oil because Porsche/Mahle forgot to drill the oil return holes into the pistons. The rings can't deal with the excess oil, thus the engines use oil and the oil reduces the effective octane available, making the GTS engines ping, especially in hot weather. This can be fixed, when the engine gets rebuilt....we've fixed many.
Note that we virtually "cured" this, when we changed a couple of engines over to Torco. I'd sure like to get some more data/testing on this. How about an experiment? I'll send you some Torco and you try it and relay the results?
08-31-2008, 04:25 PM
#103
Former Sponsor
Mark:
It's true, as far as I know. I've taken apart engines from all the different years and every engine that I've seen has the same issues. I have not taken apart any of the "late replacement" engines, so I don't know if Porsche found the problem and corrected it or not. There was never a technical bulletin on the subject, so I assume that they did not find the problem.
It's true, as far as I know. I've taken apart engines from all the different years and every engine that I've seen has the same issues. I have not taken apart any of the "late replacement" engines, so I don't know if Porsche found the problem and corrected it or not. There was never a technical bulletin on the subject, so I assume that they did not find the problem.
08-31-2008, 07:40 PM
#105
Rennlist Member
jcorenman commented earlier the GF-4 rating contains the lower level of ZDDP, not SM.
The high mileage low ZDDP oils from Mobil 1 have the SM rating along with GF-4. 15w-50 doesn't have the GF-4 rating.
To add to the confusion is this bit from the API website on diesel certificaton for GF-4, not sure how this applies to gas engines:
The high mileage low ZDDP oils from Mobil 1 have the SM rating along with GF-4. 15w-50 doesn't have the GF-4 rating.
To add to the confusion is this bit from the API website on diesel certificaton for GF-4, not sure how this applies to gas engines:
Here's what I learned after actually reading those specs: https://rennlist.com/forums/showpost...2&postcount=77
Cheers, Jim