To maintain Ultra's engine warranty you must change the oil, at or before, 4000 miles or 4 months:
http://www.pennzoil.com/#/warranty
Consider the 2005-2007 Porsche 911 Carrera and Carrera S models which have 20,000 mile / 2 year oil change intervals:
http://www.porsche.com/filestore.aspx/de...iletype=default
Pennzoil is recommending that if you use Ultra, in that vehicle, you must change the oil 5 times more often than Porsche suggests.
Pennzoil isn't stating that Ultra will fail, after the 4000 mile/4 month mark. Yet they are suggesting that it will no longer meet, their own minimum protection threshold, thus making it unwarrantable after that point.
The consumer, in the above scenario, may conclude that Ultra is an inferior product. Reasoning that a superior product would not have to be replaced more often.
http://www.pennzoil.com/#/warranty
Consider the 2005-2007 Porsche 911 Carrera and Carrera S models which have 20,000 mile / 2 year oil change intervals:
http://www.porsche.com/filestore.aspx/de...iletype=default
Pennzoil is recommending that if you use Ultra, in that vehicle, you must change the oil 5 times more often than Porsche suggests.
Pennzoil isn't stating that Ultra will fail, after the 4000 mile/4 month mark. Yet they are suggesting that it will no longer meet, their own minimum protection threshold, thus making it unwarrantable after that point.
The consumer, in the above scenario, may conclude that Ultra is an inferior product. Reasoning that a superior product would not have to be replaced more often.