I have just purchased some Penrite ten tehths Racing 10 10W-40 with 2,200 ppm of zddp.
They have a range of oils suitable for our bikes with zddp fron 1,000 to 2,200 ppm. take a look at their listings here http://www.penriteoil.com.au/product-catalogue and I understand it is available in the USA
They have a range of oils suitable for our bikes with zddp fron 1,000 to 2,200 ppm. take a look at their listings here http://www.penriteoil.com.au/product-catalogue and I understand it is available in the USA