It’s a silly question. There are way more other factors to making it to some arbitrary mileage level, than if gtl base stock is used.
And is this a question because of the wife’s tale of “fake synthetic”, or because it may actually be overkill given that engines have reached high mileage on lesser oils plenty of times?
Not a silly question at all. It’s only silly because none of us really know the answer.
Let’s talk about why:
It has been reported that less than 1% of all vehicles make it past 200,000 miles. Now if you drive certain Toyota, Honda, and Ford Panther based vehicles, it really doesn’t matter much what motor oil brand or base is involved. (Unless you really do something stupid).
However, if you own certain problematic US branded small turbo charged engines, Jag, Mercedes, VW or BMW engines that there is a high probability of required engine wear work around the 150,000 mile mark - we are talking about you. No need to name names.
Now, if you knew in advance, that a higher percentage of Pennzoil primarily GTL based + additive package owners were getting well over the average mileage:
1) Would that affect your decision to buy and use it?
2) Or, would you use any other available choice, since it won’t make a difference at all? Just blindly grab Super Tech or Mobil 1.
The point of the question is we hear of the benefits of Pennzoil Platinum/Ultra Platinum. However, we very rarely hear from the long term, real world 300,000 mile boasts from such owners.