Mobil 1 15W-50 has been re-released with "normal" levels of zinc in it, from what I've read (see http://www.mobil1.com/USA-English/MotorOil/Oils/Mobil_1_15W-50_.aspx). But, that's way too thick of an oil for his 2.7v6. I might switch my XJ to it next time around, it runs Mobil1 0W-40 now. GM EOS has a heavy dose of ZDDP. Plain old STP does too, but only a very modest amount. -steve c. ---.--- This Black Jug of 'Delvac' is 15-40 Wt - CI-4 'Plus' - SM - SI rated and came in just under $9.00 for the Gallon so $2.25 a quart complete with the no longer in print 'ZDDP' anti wear package. 15-40 isn't bad - right ? I mean, ..... 45min. North of NYC isn't exactly 'Springtime in Anchorage'...... with 175K on the Cherokee clock - if it's 'slo to flo' - the extra clearance in the bearings might take up the slack - conceptually...;) _______________________________________________ Amc-list mailing list Amc-list@xxxxxxxxxxxx http://www.amc-list.com/mailman/listinfo/amc-list