I figured here rather than the for sale area because this pertains to fours. I have available specially blended NON-DETERGENToil with the proper amount of ZDDP to run in our flat tappet motors. This oil is blended from pure Pennsylvania crude by a specialty oil company that blends for race and off-road applications. I have been working with them over the winter and 40wt is done now. 30 and 50 will be done in a couple weeks. These are true wts. It is availible in straight 30-40-50wts in a 5 gallon pail with a spout. Finally we have something to use that has these properties. Oh, and this is for off-road use only. PM me for more info.