I now only use off-road only oils in my boat. For a while, I was able to use Rotella T, but they started reducing the zddp in it as well.

The biggest effect is on non-roller cam engines, such as those in my boat. After wiping flat a few cams, I learned alot about this.

Only off-road-only oils now have the old level of zddp in them.

I also use Mobil One Gold Cap in the 97 and 01, and use off road in the rest.

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Thank You!
Fred
2009 ML350
2004 SL600
2004 SL500
1996 SL600
2002 SLK32
2005 CLK320 cabrio
2003 ML350
1997 C280 Sport