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Oil analysis, QS synthetic
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Posted by zanzabar [Email] (more from zanzabar) on Thu, 7 Dec 2006 10:11:10 Share Post by Email
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First set of numbers from first analysis 11/05, second set from 11/06. Notable improvement due to recular usage of Techron, new spark plugs, engine flush and many miles on good quality synthetic oil (Amsoil, but also some cheapo synthetics).

Analysis # 1 (first set of numbers) 111137 miles on the car and 3900 on the oil with 1qt of topup during a filter change. Amsoil turbo formula 10-30.

Analysis #2 (second set of numbers) 130150 miles on the car and 5000 miles on the oil (no topup). Quaker State Advanced Engine synthetic 10-30.

WEAR METALS
Iron: 11 9
Chrom: 1 1
Lead: 4 5
Copper: 6 3
Tin: 1 0
Aluminum: 3 3
Nickel: 0 1
Silver: 0 0

CONTAMINANTS
Silicon: 26 (Flagged) 3
Boron: 77 3
Sodium: 6 3
Potass: 3 1

ADDITIVES
Magnesium: 536 23
Calcium: 2224 1903
Phosphor: 1135 654
Zinc: 1184 822
Moly: 20 23

PHYSICAL ANALYSIS
Fuel: A A
Water: <0.1 <0.1
Glycol: N N
Visc 100c cST: 9.8 9.3
Oxidation: 44.0% 17.0%
Nitration: 11.7% 11.0%

You can definately see the difference in the additive packages between these two oils, but I sure am happy with the wear numbers even with the cheap oil. With these numbers I feel completely safe in continuing to use the QS and other cheapo full-synthetics instead of AMSOIL or Mobil 1.

These Saabs sure do rack up the oxidation and nitration though. If those numbers were a little lower I'd be happy with better oil and 10k mile changes, but it's just not worth it.

I will also continue using the 10-30 weight year round, even in my cold climate (Michigan). From what I've read, it's best to avoid as many viscosity modifiers as possible. 10-30 from what I understand should have the least amount possible.



posted by 35.10.23...


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