I was enquiring at Fuchs lubricants down here about oils for my application, and they offered the Titan GTO, and pointed out it was a Group III, and thus the asking price was $40 for 5 litres, rather than $62 for 5 litres for Mobil. I was impressed that they were up front with the distinction, and the price (some major oil blenders aren't so free with either detail). OK, now Pennzoil Longlife (GRII) is $30 for 5 litres. Fuchs Titan GTO (GRIII) is $40 for 5 litres, and Mobil 1 is $62 for 5 litres. Redline runs over $100 for 5 litres, adn you don't want to know what Royal Purple costs. Good value ?? or is GrIII THAT far inferior to IV and V ?