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More good info
Posted by Technical Ecstasy [Email] (more from Technical Ecstasy) on Tue, 20 Jan 2009 06:06:54
In Reply to: That's not correct., David Ingram, Fri, 16 Jan 2009 09:55:36
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Posted by a GM Engineer:
Keep in mind that there are a lot of reasons to change the oil. Oil
oxidizes with time and temperature, oil gets contaminated with
combustion byproducts, oil gets contaminted with soot from blowby, oil
gets contaminated with fuel and water...particularily during cold
starts, acids form in the oil, oil gets contaminted with dust/dirt/
debris, the antiwear additive in the oil (the "zinc" or ZDP) gets
depleted with engine revolutions, the antioxidants/
anti-acids/detergents/dispesant additive deplete with time and engine
revolutions.
Synthetic oil addresses the oxidation as it will handle higher
temperatures but that is about the only advantage of synthetic...so...in
short, using synthetic does NOTHING to allow a longer drain interval.
Synthetic has the same amounts of ZDP, same problem with fuel and water
contamination, same problems with other contaminates including soot,
same problem with acid buildup, etc.... All reasons why synthetic oil
does NOT allow longer drain intervals. The water from combustion
byproducts/blowby combines with the sulfur in the fuel in blowby to form
sulfuric acid over time so oil acidity slowly increases with time and
miles and synthetic oil does nothing different to prevent this. You have
to change the oil before the anti-acids in the oil additive package are
overwhelmed. If oxidation were the only reason to change the oil then
synthetics would have an advantage in terms of life or extending the
drain intervals. Unfortunately, oxidation due to temperature is RARELY
the determining factor for the drain interval so any advantage
synthetics might have in this area are moot. I would recommend sticking
to the recommended drain intervals even if you use synthetic oil.
posted by 71.252.127...
Posts in this Thread:
- v-6 owners! synth or dino and what interval?-curiosity, bkrell2, Thu, 15 Jan 2009 06:31:54
- Use what Saab recommends, synthetic, David Ingram, Thu, 15 Jan 2009 10:08:31
- Why just 3k, Technical Ecstasy, Fri, 16 Jan 2009 05:59:50
- Oil 101, David Ingram, Fri, 16 Jan 2009 06:35:55
- Oil base, Technical Ecstasy, Fri, 16 Jan 2009 09:22:35
- That's not correct., David Ingram, Fri, 16 Jan 2009 09:55:36
- More good info, Technical Ecstasy, Tue, 20 Jan 2009 06:06:54 <-- Viewing This Message
- BTW,, Technical Ecstasy, Fri, 16 Jan 2009 12:30:08
- Base Stock, Technical Ecstasy, Fri, 16 Jan 2009 12:15:42
- Re: v-6 owners! synth or dino and what interval?-curiosity, joewayrn, Thu, 15 Jan 2009 08:55:06
- Re: v-6 owners! synth or dino and what interval?-curiosity, Henry, Thu, 15 Jan 2009 08:22:12
- Mobil 1 FULL Synthetic every 5k miles!!!, B Millar , Thu, 15 Jan 2009 06:47:30
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