Does the sulfated ash (SA) level really matter for intake-valve deposits (IVD)?

How?
The cat principle is still same. Maybe the precious metals mix has modified recipe...
I think piston rings were thicker and firmer back then. The main reason IMHO.
 
Perhaps emissions systems today are asked to do more compared to those used in the 1990's?
How?
The cat principle is still same. Maybe the precious metals mix has modified recipe...
I think piston rings were thicker and firmer back then. The main reason IMHO.
Oils got thinner and the propensity for consumption went up.
 
Back
Top