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Old November 29th, 2017, 21:40   #339
Veteran Member
Join Date: Apr 2001
Location: Southeast Texas
Fuel Economy: 37 MPG (~ 45% city)

Originally Posted by donDavide View Post
CK4 are supposed to be safe for trucks with DPF, But I can't find sulfated ash, I wonder how it compares to 507.00 and MB 229.51?
According to these API CK-4 Amsoil flavors the sulfated ash is between 0.91% and 1%:

Compare that to the 0.6% for the Mobil 1 ESP Formula 5W-30:
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