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Message: <blockquote data-quote="kawasakikidd" data-source="post: 418391" data-attributes="member: 10588"><p>i use mobil 1 full synthetic 15/50 i got 126,000 miles on the clock.i bought mobil 1 10/30 2 changes ago and had about 1100 miles on it and is was 1/2 quart low i dont know if it is too thin for mine or not.but i went back with 15/50.my brother said that synthetic oil is thinner than standard oil so he has always run 15/50 in his 5.0 foxbody stangs hes had three and swears by the stuff.beware of other brands like castro, quaker state,valvoline,and others that claim full synthetic.i heard they are standard oil based with additives added to them not full synthetics.the only pure 100% manmade full synthetics are mobil1,royal purple, amsoil that i know of.but if you go to amsoil website the oil they try to say they are better than and does comparisons with is mobil 1.so that should tell you who their threat is.mobil 1 if you can afford it. if not i would run valvoline 10w40 highmileage in it if you want to go with conv. oil.which is very good oil just change it regularly.just remember good quality oil syn.or conv.and a good oil filter and the car will love you for it.peace</p></blockquote><p></p>