Mobil recommends Mobil 1 synth 15W-50, not 10W_30, for pushrod engines. This would include ALL AMC engines, sixes or eights. It contains some ZDDP, and they recommend it specifically for non-filtered engines. A May 2010 chart showing all the oil specs and the zinc (ZDDP) level is here: http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf I'm running Mobil 1 15W-50 on the next oil change, and I'll have the full filtration back in by then. _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com