I'm still seeing SL oil around here. For example I see SAE30 Pennzoil YB and it says SL on the donut.
Is it safe to assume that it has 1000 ppm or more of ZDDP? Or could it have been lowered to SM standards but still have SL on the bottle?
Is it safe to assume that it has 1000 ppm or more of ZDDP? Or could it have been lowered to SM standards but still have SL on the bottle?