pbm:
What are you basing that statement on? What numbers on the chart appeal to you? Just curious, trying to learn.
I'm certainly no expert but I like the low volatility (aka NOACK which should help with valve deposits), cold pumping numbers @ -31*F, the moly, the boron and decent TBN.....all at a great price...
I'm sure it uses a Gr.III base oil and would imagine that Mobil1 AP uses something more 'exotic'....and it
should at nearly twice the price. IMO, for the average guy doing 7 or 8K OCI's, the QSUD is hard to beat for value.