Shear stable so far: 3,000 miles on GC in a 2002 SAAB 9-5 Aero (high output turbo)

[quadrun1]

Only about 3,000 miles on it so far, but the viscosity is close to when new (65.8 SUS versus 64.7 SUS). Some of that thinning is undoubtedly due to the 1.3% fuel dilution (lots of cold weather this winter, and perhaps insufficient oil warmup before sampling)

Planning on running this oil 6,000 miles total. Previous UOAs were on M1 0W-40, which typically thinned out 8%.

TBN=4.3; subtract 3 from Fe (VOA). Wear seems to be decreasing evenly as the engine breaks-in, at about the same rate as the M1 0W-40.

(plain text: 2,872/17,154/02-10-04, Al 2, Cr 0, Fe 11, Cu 4, Pb 8, Sn 2, Mo 17, Ni 0, Mn 4, Ag 0, Ti 0, K 0, B 26, Si 6, Na 3, Ca 2926, Mg 98, P 732, Zn 890, Ba 0, SUS 210°F 64.7, Flashpt 360, Fuel 1.3%, Antifreeze 0, Water 0.0, Insol 0.4%)

[ February 19, 2004, 12:44 AM: Message edited by: quadrun1 ]

 

[TooSlick]

Virgin TBN on this formulation is approx 9.5, so you are down about five points from that in 3000 miles. It's nit picking, but I'd probably change @ 5000 and not 6000 under these conditions. You really want to keep the TBN at or above 2.0 in a gas engine, since the test just isn't that accurate.

Nice reduction in wear rates....I drove a 2003, SAAB 9/3 Linear last month and have always had a thing for the old 900's

I suspect Manganese is from the fuel you use once in a while....

TS

 

[Patman]

quote:

---

Originally posted by TooSlick:
Virgin TBN on this formulation is approx 9.5, so you are down about five points from that in 3000 miles.


TS

---

You know I can't let this one go without commenting. In 3MP's study, Amsoil dropped 8.2 points in 3000 miles!! From 12.5 to 4.3. And 3MP's engine is not turbocharged either.

I used to believe Amsoil was slightly better than GC, but all signs are pointing to the opposite right now, at least in the shorter drains (kinda hard to say for sure how it'll do in longer drains when nobody has posted a long UOA yet, although I'm confident it'll do well)

 

[buster]

I agree with Patman here. So in the 3MP study it's leveling off, but here it's on it's way out?

 

[quadrun1]

We shall see!

In about a month we'll have a 10,000 mile GC sample from my dad's 528i.

 

[CosmicFlash]

"Planning on running this oil 6,000 miles total. Previous UOAs were on M1 0W-40, which typically thinned out 8%."


quadrun,

Was the first UOA done on the factory fill? Are you assuming it's Mobil 0W 40? Could it be their Saab 0W 30 Turbo oil? Your moly readings seem different...

 

[quadrun1]

CosmicFlash: Yes, I *thought* the factory fill was M1 0W-40 (at least that's what I've been told), but it looks more like the SAAB 0W-30.

 

[J]

quote:

---

Originally posted by quadrun1:
CosmicFlash: Yes, I *thought* the factory fill was M1 0W-40 (at least that's what I've been told), but it looks more like the SAAB 0W-30.

---

Yes, that was misinformation from Saab TSB.

But VOA/UOA comparison told the
real story. Additive levels just do not increase
from VOA to UOA.

So ... Is Moly the cure all that never was?
The two flavors of the month in BITOG are
GC 0W-30 and Mobil 1 5W-40 neither of which has
Moly.

Jae