Quote:
Originally Posted by 997_986
Needless to say, that scoring will not be prevented by additives, its root cause is the loss in viskosity of xW-40 oils on bank 2 due to excessive heat, especially of cyl 6 due to a lack in design of cooling.
No intend to start a scoring-thread, but that is the (main) cause. Use higher weight oil instead of additives.
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While this is true, that it is a contributing factor, there is a reason oils with high zddp and/or moly is recommended. Charles says planly in the quote that high moly content helps with prevention.
Avoiding 0w-40 oils (which shear out of viscosity faster) and changing to a low temp thermostat are two other things that might help. I have done both of those as well.