Mobil 1 observations - one more datapoint
 

Being a person who loves to experiment, I put Mobil one (15W-50) in the 911 at my most recent oil change.

I was a bit leery having seen the reports here and elsewhere about leaks developing after people switched to a synthetic. But I am happy to report that after about 500 miles I have no leaks.

Being an optimist, too, I had hoped that my oil temperatures would decrease on the highway at high ambient temperatures but I can't say that they have.

I'll do at least one more change using Mobil 1, especially to look at the condition of the oil that I remove. If I see anything unusual, I'll report back.

You all know the dangers of generalizing from a sample of one, so YMMV.

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Rod Walter
'88 911 coupe

I could be wrong but I believe that you will not se the leaks if any, immediately but after the synthetic oil has deteriorated the rubber seals!.
Might take a few months or years to notice a degradation!.
However my car leaks and the car has used Mobil one for the past 10 yrs I believe. For me I would be prepared to suffer the odd drips for the lengthening in life of the engine and components- But what do I know http://www.pelicanparts.com/ultimate/smile.gif

I could be mistaken here, but I was under the impression that Mobil 1 would not actually deteriorate the rubber seals, but that rather it was slippery enough to get past seals that were old and deteriiorated to begin with. At any rate, I have also heard that it takes a few months for this to happen.

For what it's worth I have used Mobil 1 15-50 in my 78SC for two years with no increase in leakage.

Rod,
You can sleep easy tonight! Mobil 1 will *not* cause your motors seals to deteriorate now or ever. In a 356 maybe, but not your '88 911. Go for a drive!

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'81 SC Coupe (aka: "Blue Bomber")
Canada West Region PCA
The Blue Bomber's Website

Thanks, Doug, for the reassurance.

86Ragtop, actually I was concerned with a synthetic's lower coefficient of friction allowing it to seep past seals (as Serge implied) rather than causing damage to the seals themselves. And I believe that this would happen rather quickly as the old oil is purged from any tiny gaps that might exist between seals and mating surfaces.

I am a believer in the superior lubricating properties of a synthetic. Now I just have to convince myself to spend $50 every 3,000 miles as opposed to $20 because I won't extend the service interval.

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Rod Walter
'88 911 coupe

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I've been thinking about changing to mobile 1 in my 912 as of late, so what would the advantages be and is is safe for the 912?

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Joshua Harrison
1968 912 Coupe
www.geocities.com/jkh912
54 days till I'm reunited with my 912!!!!!!!!

Hello

The newer 5/50, 0/50 or the 0/40 oils for the modern engines make the trouble. They will eat the old hylomar, atmosit and curil seaking used in the ancient times up to the 3,2 L. Some off them don´t eat gaskest/sealer but will drop due there penetration quality.

Such oils does not have benefits that will wight up the risk to use them on old engines.

New oils where made for 20000 mls intervals and are designed for complete other or new tasks.

Porsche has a own approval for there oils witch also tests the compatibility to old sealers. But it is not a absolute criteria.

Grüsse