It's the late 2000's and you've just started selling cars in the USA. These engines have a long history of running hundreds of thousands of miles. You start replacing engines under warranty between 40,000 and 60,000 miles - rings are stuck, power is down, wear is up. It's costing big money! The US petroleum oil is not good enough! Quick! A TSB! 5W-30 synthetic that meets 505.00! Oops - new TSB - it's got to be a synthetic that meets 505.00.

(Watch, shaking, as CNN announces that Benz was hit with a $32 million class-action lawsuit in the US, with another to follow in Canada, because they didn't properly notify owners that the oil life recommendations were based on synthetic oil...)

TCH-43mpg
VW TDI--48
08 LS 600 HL-20
08 LX 470-16