Mobil 1 TDT 5W/40 - 5,666 Mi, SAAB 9-5 2.3L lpt

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Made the change to Mobil 1 TDT about 20k (4 changes) ago. When using GC 0w/30 bearing wear was a bit higher than I'd like - not critical, but not great either. The 2.3L SAAB really does need a 40wt oil. With the SAAB being a sludge prone engine and very hard on oil, the M1 TDT seemed to be a good choice and my latest UOA supports this nicely! This is a great oil for my engine. Blackstone Comments: Your engine has gained roughly 20,000 miles since we last saw a sample from it but wear looks better than ever! All wear now reads well below universal average levels and judging from what we found here your engine is free of any obvious problems. We don't know what you've done to get wear so low, but keep it up. We had been finding lead and copper, from the bearings, above average but now both read well below average. The TBN read 4.2 so you still had plenty of active additive remaining. We consider 1.0 too low for extended use. Nice engine!
 Code:
Oil  			Mobil 1 TDT - Castrol (GC) - Castrol (GC)

Weight  		5W/40 - 0W/30 - 0W/30
Makup qts		0.5 - 0.5 - 0.0
Miles on oil		5,666 - 4,845 - 4,998 - [5,100]
Miles on engine		79,299 - 58,937 - 54,092 - [n/a]
Sample Date		05/24/08 - 03/03/07 - 12/01/06

Aluminum		2 - 3 - 3 - [3]
Chromium		1 - 1 - 1 - [1]
Iron			11 - 55 - 40 - [22]
Copper			2 - 6 - 10 - [5]
Lead			1 - 10 - 4 - [6]
Tin			0 - 0 - 0 - [1]
Molybdenm		11 - 3 - 6 - [52]
Nickel			0 - 1 - 1 - [1]
Manganese		0 - 1 - 1 - [1]
Silver			0 - 0 - 0 - [0]
Titanium		0 - 0 - 0 - [0]
Potassium		1 - 0 - 2 - [1]
Boron			30 - 0 - 6 - [39]
Silicon			7 - 5 - 11 - [8]
Sodium			8 - 15 - 18 - [20]
Calcium			2,453 - 1,588 - 1,778 - [2,130]
Magnesium		446 - 425 - 468 - [259]
Phosphorus		980 - 796 - 887 - [839]
Zinc			1,304 - 932 - 1084 - [992]
Barium			0 - 0 - 0 - [5]

Note:  Universal Averages in [brackets]

Sus Visco (210F)	70.6 - 64.7 - 63.4 - s/b 58-65
cSt Visco (100C)	13.10 - 11.52 - 11.16 - s/b 11.6 - 15.3
Flashpoint (F)		405 - 355 - 375 - s/b >385
Fuel %			<0.5 - 1.5 - 0.5 - s/b <2.0
Antifreeze %		0.0 - 0.0 - 0.0 - s/b 0.0
Water %			0.0 - 0.0 - 0.0 - s/b <0.1
Insolubles		0.3 - 0.3 - 0.3 - s/b <0.6
TBN			4.2 - 3.8 - 3.6 - S/b >1.0
 
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Hmmm lots of 1-gallon SL containers at my local Wal-Mart on clearance right now for <$20, maybe I should stock up for my wife's Saab...that looks great, nice change from the GC.
 
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I'd stick with the M1 TDT. Great oil. One of the best all around IMO.
 
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Nice wear numbers, nice TBN retension and look at those nic Flash point numbers!This is what I expect from all oils wich is why I get kind of hard on PP. For me TBN and flash point are insanely important I actualy put them before slightly better wear numbers in many case's. I also like low consuption!
 

OVERKILL

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Everyone harps on M1 for iron readings, but your UOA shows 1/4 the iron (I would think this would be above any "noise") of the GC........ Copper and Lead also look to be substantially lower....... Great looking UOA!
 

JAG

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 Originally Posted By: OVERK1LL
Everyone harps on M1 for iron readings, but your UOA shows 1/4 the iron (I would think this would be above any "noise") of the GC........
Most of the people who harp on that don't even post in the UOA forums. That doesn't say much about their oil performance knowledge. There is a tendency to group all M1 oils into one bag, which is misleadingl given the significant variations in performance/properties among the different viscosity grades. Yeah, M1 5W-40 TDT is excellent and does exceptionally well in some engines, this being one of them.
 
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Absolutely, JAG. Not all M1's are created equal. I don't know how this new evolution of TDT compares to the SL Delvac 1 formulation, but it was a whole different animal compared to standard fare M1 of that pre-Katrina time. I imagine that it still is.
 
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That looks great nice to so some people are open minded enough to try a 5W40. I think highly of 5W40 as a great all around comprimise. Since you are already useing a 5W40 would you consider doing a run with RTS5W40 just so we can see how it compares to M1 TDT 5W40? Keep it up!!! You have to love the high flash point as well!
 

f1forkvr6

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I think the higher ZDDP levels in the M1 TDT (nominal Phosphorus levels reportedly 1100 ppm), along with the slightly higher viscosity helped quite a bit. This particular SAAB engine is very hard on oil, and usually shears it quite heavily. Another note, most of the miles accumulated by this car were for short trips -- anywhere from 4 to 20 miles. Usually only 1 multi-hour highway run every six weeks or so. As long as the formulation continues to remain close to current, I'll keep using the M1 TDT in this vehicle.
 
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