Quote:
Originally Posted by Smallblock454
Just a few thoughts:
ZDDP won't prevent plastic from aging. Chain ramps are made of plastic.
ZDDP will always harm your catalysators. It's not a matter of the amount in the oil.
So DT 40 was designed to be changed every 6 months or less than 5 K miles. Nice cash cow.
Are there alternatives? There are ester based fully synthetic oils - for example Motul 300V - out there that can be used for 12 months and more miles that don't harm any catalysators, but have a maximum sheer stability.
Just my 2 cents
Regards, Markus
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Worn plastic wear pads on chain tensioner paddles do not often kill engines, but metal to metal wear always will.
There are several good full synthetic products out there, but none of them has an appreciable level of ZDDP in them, and ZDDP remains by far the best anti-wear additive currently available. The data implicating ZDDP's role in cat degradation appears questionable, at best. And, while shear stability is important, it is not the entire determinant is engine wear, which is why all oils carry anti wear additive packages.
So you can call it a "cash cow" if you so please, but at the end of the day you have a $20K lump in the back of your car whose life expectancy that just may be dependent upon the quality of that additive package.