Just another data-point.
About 2K miles ago, I was running Chevron Delo 400 15w-40 in our Mercedes C36 which has an "aggressive" valve-train.
Cold, warm, or hot, you can "hear" the cams when the oil was new and with 2K miles on it.
Changed out to German Castrol Syntec two days ago and 100-miles later, all is quiet.
Even on a regular diet of Mobil 1 15w-50 (before the Delo 400), it wasn't this quiet.
Let's hope it lasts . . .
Next time Schaeffers . . .
neil
About 2K miles ago, I was running Chevron Delo 400 15w-40 in our Mercedes C36 which has an "aggressive" valve-train.
Cold, warm, or hot, you can "hear" the cams when the oil was new and with 2K miles on it.
Changed out to German Castrol Syntec two days ago and 100-miles later, all is quiet.
Even on a regular diet of Mobil 1 15w-50 (before the Delo 400), it wasn't this quiet.
Let's hope it lasts . . .
Next time Schaeffers . . .
neil