2015 Forester XT Mobil 1 ESP Formula, 7718 km (4800 miles)

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Hey guys, Here's my latest UOA with Mobil 1 ESP Formula 5w-30. Iron is at an all time low but aluminum is up a bit. Previous UOAs were as follow: 91 182 km was with Rotella Multi Vehicle 5w-30 82 271 km was with QSUD 5w-30 74 956 km was with QSUD 5W-30 67 931 km was with QSUD 5w-30 64 076 km was with PP 5W-30 This UOA also stayed in grade like the Rotella MV, which leads me to believe that HDEO and C3 oils will shear less than Ressource Conserving oils.
 

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True, shearing a bit. Actually, I think Subaru knew this when it specified 5w-30 for their turbo engines, and 0w-20 for non-turbo ones, since they expect the turbo version will shear down & fuel dilute some. So its probably not a big deal. (Imagine if a 0w20 was used, it would shear/dilute down to an excessively low HTHS.) You did make a good choice of oils, some of the best around. M1 ESP & Rotella Multi. Rotella can be ordered from Walmart at a decent price. Great iron wear numbers with the thicker oils. On the Rotella website, a bitog user said: ★★★★★5 out of 5 stars. Ignatius · a month ago Best 5W-30 oil currently available! I use this oil in my car's GDI engine and I know several people who love using it in their high performance Subaru engines like that of the STi, WRX, and Forester XT. It just doesn't shear like other 5W-30 oils often do. I am very happy that Shell offers this product but it is very difficult to find in stores and usually online retailers offer it at a more premium price. I hope it is made more commonly available in the future!
 
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Originally Posted by MParr
Not too bad. Once again, I CANNOT agree with Blackstone on running the OCI to 10,000 km.
Why is that? Low wear metals, plenty of TBN left and still in grade, I would think it's fine.
 
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I just noticed that the insoluble is at 0.4% and it never has been over 0.2% before, anything to worry about? Filter used was Fram Ultra and before it was Wix or OEM.
 
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I notice d that was high-ish. I'd try another filter. Best = Mazda Rx8 Tokyo-Roki if she fits. But Maybe not on a T car. Most all Japanese cars use the same spin on filter with minor variations in outer dimensional L , W and bypass. ( but Toyota goes their own way)
 
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Originally Posted by jbutch
I just noticed that the insoluble is at 0.4% and it never has been over 0.2% before, anything to worry about? Filter used was Fram Ultra and before it was Wix or OEM.
I noticed the same thing with my Explorer UOA I posted recently. I wonder if Blackstone is doing something different in judging the insoluble level than previously. Whimsey
 
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Originally Posted by Whimsey
Originally Posted by jbutch
I just noticed that the insoluble is at 0.4% and it never has been over 0.2% before, anything to worry about? Filter used was Fram Ultra and before it was Wix or OEM.
I noticed the same thing with my Explorer UOA I posted recently. I wonder if Blackstone is doing something different in judging the insoluble level than previously. Whimsey
What filter was used in that UOA?
 

Al

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Originally Posted by MParr
Not too bad. Once again, I CANNOT agree with Blackstone on running the OCI to 10,000 km.
Thats only 6200 miles. coffee
 
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Originally Posted by Al
Originally Posted by MParr
Not too bad. Once again, I CANNOT agree with Blackstone on running the OCI to 10,000 km.
Thats only 6200 miles. coffee
That's what I though as well, 10k is even what Subaru specify for oci. Since the thread as been brought up, I have a small update, I changed the oil yesterday and put in some Pennzoil Euro LX 0w-30 for the cold Canadian winter that is already here. Will do an UOA and post it in this sub forum.
 
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