csandste: Maybe I can try to answer your question. Most major brand synthetics (Pennzoil, Mobil, Valvoline, Castrol, Chevron, etc) met the SL spec long before the conventional oil did. Here again, the marketing boys run the show and the budget. I can tell you that our synthetic is just now starting to see the SL labels come out. The reason for this was all the oil companies had tons of old SJ labels, and they are going to use them all. And, the oil companies always change the conventional label first because this is what they sell the most of. On the national average, synthetic sales are only about 6% of the business. It's just economics and marketing.