Re: Use Mobil 1 0W-40 or 15W-50 - Saab 9-5 Bulletin Board - Saabnet.com
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Re: Use Mobil 1 0W-40 or 15W-50
Posted by Dean (more from Dean) on Fri, 19 Sep 2003 06:10:18
In Reply to: Use Mobil 1 0W-40 or 15W-50, Jason 0W-40, Thu, 18 Sep 2003 21:09:52
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Usual rant:
The oil experiences higher temperatures in the top piston ring groove. This groove has been moved closer to the top of the piston. The water cooled turbo bearings are not as hot as that. This is where oil breakdown will happen if at all. When the top piston ring is coked and stuck, the engine is in trouble. Compression goes down and oil consumption begins. Blow by gases increase and this promotes oil oxidation and sludging. There is not much oil circulation at the rings, so addatives are not much help. You need an oil base stock that is resistant to breakdown. Dyno and FakeTec(tm) products can't hack it.
A high compression normally asperated high performance engine will probably have higher temperatures at the top ring than a turbo charged engine. Turbo engines need to have lower compression ratios.
posted by 208.24.17...
Posts in this Thread:
- Not the Oil again....., Jake , Thu, 18 Sep 2003 18:37:08
- Aww ... I _missed_ it!!, Alazon, Fri, 19 Sep 2003 17:01:37
- Synthetic oil stinks.., dtech, Fri, 19 Sep 2003 12:31:38
- Full synthetic (PAO base) xW-30 will be fine n/m, Dick in Falls Church, Fri, 19 Sep 2003 08:22:18
- Good idea. Why not stick with the dealer oil? (+), Vlad, Fri, 19 Sep 2003 08:02:56
- Well, this has been helpful, eh?, Eiron, Fri, 19 Sep 2003 07:22:13
- Use Mobil 1 0W-40 or 15W-50, Jason 0W-40, Thu, 18 Sep 2003 21:09:52
- Re: Not the Oil again....., Dean, Thu, 18 Sep 2003 18:53:17
- Re: Not the Oil again....., Ed NC, Thu, 18 Sep 2003 18:45:38
- Here's a link..., JCarpio, Thu, 18 Sep 2003 21:32:59
- Re: Here's a link..., JCarpio, Thu, 18 Sep 2003 23:31:34
- Re: Here's a link..., Jason 0W-40, Fri, 19 Sep 2003 07:52:38
- Whew..... Results?, Jake , Fri, 19 Sep 2003 09:42:00
- Re: Whew..... Results?, Josh, Fri, 19 Sep 2003 12:10:33
- Woo-Hoo!! "Fresh meat !!", Eiron, Fri, 19 Sep 2003 12:42:37
- Re: Whew..... Results?, Jason 0W-40, Fri, 19 Sep 2003 12:33:07
- Re: Whew..... Results?, Stephen Goldberger, Fri, 19 Sep 2003 12:29:48
- Thanks for the info, Josh, Sat, 20 Sep 2003 05:53:20
- Small, almost insignificant, correction, Eiron, Fri, 19 Sep 2003 12:54:02
- Succinct and to the point; very well said Mr. G. N/M, REM in Seattle , Fri, 19 Sep 2003 12:37:01
- You beat me to the punch, "I owe you a beer" :-) (n/m), Jason 0W-40, Fri, 19 Sep 2003 12:35:09
- Maybe why it looks worse?, Eiron, Fri, 19 Sep 2003 10:30:50
- Re: Whew..... Results?, Jason 0W-40, Fri, 19 Sep 2003 10:05:34
- Re: Whew..... Results?, Stephen Goldberger, Fri, 19 Sep 2003 10:02:30
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