M1 0w40, 7500 miles, Saab 9-3 2.0

[J_R]

This engine had a balance chain guide and tensioner replaced during the OCI. Do you guys suppose the nickel is from the new tensioner? Timing cover gasket and crank seal were also replaced. The engine is spotless inside, fwiw. The guide snapping in two is common with these cars, so I did this as preventative maintenance.

I had access to a lift and shop tools, so it was only a two or three hour easy job.

 

[Quattro Pete]

Not seeing your UOA results.

 

[J_R]

Fixed, sorry about that.

 

[ltslimjim]

I suppose Nickel could be from the work you performed, but if that's the case it hopefully would go quiet after the next OCI. Great results I'd say!

Also, considering the UAs show Nickel at 0 it's very likely going to go away. Anecdotal.

How long was this interval time wise? Seems like it can go a long time.

 

[J_R]

Originally Posted By: ltslimjim
I suppose Nickel could be from the work you performed, but if that's the case it hopefully would go quiet after the next OCI. Great results I'd say!

Also, considering the UAs show Nickel at 0 it's very likely going to go away. Anecdotal.

How long was this interval time wise? Seems like it can go a long time.


Thanks. The oil was run for about eight months, probably 50/50 city/hwy.

 

[Pontual]

22ppm of magnesium and 3kppm of calcium? Is this really Mobil 1?

 

[J_R]

Originally Posted By: Pontual
22ppm of magnesium and 3kppm of calcium? Is this really Mobil 1?


Yes, it was M1 0w40. Those numbers look right on par with the latest M1 0w40 VOA I can find.

http://www.bobistheoilguy.com/forums/ubbthreads.php/topics/3001485/1

 

[Pontual]

The 0W40 went from high MolyDTC, high Mg (700ppms) to only 25, changed formula to add some 260 (nothing before) of Boron and added more 1k of Ca+ over the former 2,5k ... Yes they have several different add pack M1 formulas.
I bet boron is better than mg

 

[zpinch]

Looks similar to Amsoil SS oil now.

 

[Garak]

Originally Posted By: Pontual
I bet boron is better than mg

I bet B and Mg aren't interchangeable in an additive package.

 

[Pontual]

And I bet they think that Mg isn't necessary when there is 3,400+ ppm of Calcium, like Amzoils. Or that they could fight each other?

 

[Garak]

No, it certainly isn't necessary, but there are reasons to use Mg in at least some oils, at least where limiting SA is a concern.