This is in reference to the lady that called about the VW Jetta and wether she need to contiue to use synthetic oi. You might check into VW requirements on oil. I seem to remember they had problems with sludge built-up blocking the oil sump and changed the oil specs to synthetic only.

VW Jetta and synthetic oil

markkw May 31, 2010, 11:11am 8

That’s because car companies are in the business of selling new cars and replacement parts and synthetic causes things to not wear out as quickly and thus reduces profits from sales of cars/parts.