First Oil Change?

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Oct 18, 2003 | 05:24 PM

#16

Larry T

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From: Chester, Va

re: First Oil Change

Hello,
Thanks for your thoughts.

The 26ppm was found in Don Watsons '02 996. Good idea about the casting method - they have a hard time getting all the silicone from the casting process out prior to engine assembly (from what I've read in the past) and it's entirely possible this is the source of the high level of Silicone.

You said the silicone casting process isn't used in the GT2/3 engines so we'll have to look elsewhere for a source of the high silicone content in the GT3 shown in the Test Results data.

Larry (74 911)

Oct 18, 2003 | 05:30 PM

#17

DonW-Cape Cod

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From: New London, NH & Naples

Hi: Just in case you're wondering, I mis-spoke when I mentioned metal in my oil. It was silicone just as Larry said. My concern was that the higher than normal silicone content (wherever the source) was sufficient for me to decide and change the oil. I don't see how additives would have compensated for the additional abrasiveness caused by the silicone content.

Oct 19, 2003 | 04:05 PM

#18

rdstemler

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From: Cape Cod

My first analysis showed 58ppm Si. The evaluation was suppossed to normal for break-in. My second at 6950 miles (first at 3265) showed 12 ppm SI. However my fuel% Vol went to 6.5 and now needs watching. I'll be doing a third analysis about the second week of November. I'll have about 10,500 miles.

It's nice to be able to trend your engine.

Oct 19, 2003 | 06:05 PM

#19

umn

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Quote:

Originally posted by DonW-Cape Cod

...
I don't see how additives would have compensated for the additional abrasiveness caused by the silicone content.

Hi Don,

basically higher silicon content does not necessarily mean abrasiveness. In order for the silicon particles to be abrasive, they have to be present in a certain granularity (size and shape) and hardness.

Firstly, most oils have silicon added as an anti-foaming agent anyway. Secondly, Porsche uses Dreibond, a silicone-based sealant in its engines which also increases the silicon content of the oil, but is harmless in terms of wear (it is not harmless in terms of possibly clogging up oil lines). Thirdly, silicon could be present from the running in process of the Lokasil cylinders but would then be present in sub-critical granularity.
Obviously, if silicon is present in the form of sand, that's wouldn't be so great.

Cheers,
Uwe

Oct 19, 2003 | 09:59 PM

#20

nova996

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From: Fairfax, VA

Thanks for all the info guys.

Quick question:

Let's say you've got a 5/03 production car and you take delivery in 10/03. And assume you only do <10k miles per year. Do you get the first oil change in 5/04 (1 year after build date) or 10/04 (one year after in service date). Remember that the car was test driven a few time between 06/03 and 10/03 probably.

Thanks.

Oct 19, 2003 | 10:51 PM

#21

jsonnen

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Hey guys, are you sure the factory runs synthetic during break-in? I've heard from several different sources that most manufacturers use mineral oil during their break-in periods!! I wonder why??

Oct 19, 2003 | 11:24 PM

#22

nova996

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From: Fairfax, VA

Quote:

Originally posted by jsonnen
Hey guys, are you sure the factory runs synthetic during break-in? I've heard from several different sources that most manufacturers use mineral oil during their break-in periods!! I wonder why??

Well, BMWs, Porsches, and some Volkwagens come with synthetic from the factory. I'm sure other brands do, too, but those are all I can say from experience.

What you are saying was the case on BMWs several years ago. BMW would recommend mineral for break-in before replacement with synthetic. But not any more.

Oct 20, 2003 | 12:10 AM

#23

DonW-Cape Cod

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From: New London, NH & Naples

Thanks for the advice unm, but for 20 bucks a pop I just don't want to take any chances with my car's motor....and God forbid should something happen I'll have a paper trail.