Well some say that they are LOW compression engines , but they are not really low compression for a working engine plus the fact that they are a high RPM engine not like the old 4 cyl. as for the low ash oil it was brought out after the 460-560 came out as when they first came out they had lots of problems with them eating exhaust valves . If you read the org. operators manual back in the fuel section it will tell you what grade of gas to run . Myself i never knew it till i bought a nice 706 late model with a 291 at a consignment auction one day as i had already bought three other 706 gassers . When the auctioneer said sold Ohio bound the owner of this tractor came up to me and handed me all his records and all his books he had for this tractor . I got to reading it , yea i sat down at home one evening and read the whole book . And there it was min. now i said MIn. octane req. was 93 RESEARCH method . Now back when these tractors were new reg. grade PUMP gas was 95 octane and hightest was 105 or better . Way back when i was a pup i worked for a construction co. and we had a bunch of gas powered trucks , some straight trucks and some semi's . guess what they required high test of 105 or better . We did not keep gasoline at the shop even though there was a 10000 gallon tank for gas . The owner siad that he did not mind helping someone out if they needed gas IF they asked for it but even back then some people would just come in and fill there tank . So we had and account at the old fuel stop west of town on US 224 and IF you were a full time employee you could buy gas there under the company name and get the discount AS LONG as you PAID cash. I had hot fast cars and they wanted Ethel and i would get good hightest for 13.9 cents a gallon . Something that i have always done till about ten years ago i ran high test in everything When i bought my first gas tractor it got hightest as i would get gas for my pick up that had a 428 SCJ inplace of the junk 360 and it loved hightest my 460 ran great on it never a problem but by around 1980 octane levels started dropping the 73 with the 428 was gone but i still ran hightest the 460 was long gone and in it;s place was a 67 706 gasser and it got fed you guessed it hightest . The old 540 4x14's were long gone and now we have 710 4x16's behind the 706 . My one buddy bought a 766 gasser and i went over to help him plow as he was having problems Ronny was cheap on everything while he and i were in the same field plowing with the same type plows i was running circles around him i was in first high with the stick ahead and he was in third low with the stick back . We stopped and i did a complete tune up on his 766 everything was by the book timing set as per the BOOK and still if he tryed to step up a gear she would start to seeze up . and he was sucking fuel big time . Took a lot of talking to get him to take his tractor one mile down the road to the little gas station and put just one full tank of hightest in it . The difference was night and day as now oh guess what he can now run first high stick ahead . On the 460-560 tractors 89 is the min. octane required . But oh wait a min . just how many times has that head been ground down in her life time . The least i have had to take off a head to get it back flat is.007 and as much a .023. And what about the deck of the block has it been shaved ?? with each shave job the compression goes up . Now the ral killer here is the fact that we can no longer get FORGED PISTONS they si all gone none to be had . and the new and IMPROVED Cast piston can not and will not take the heat like a FORGED piston . I have a collection of 706 pistons that have been replaced due to 87 FRAM gas in 706 and six out of one C221 in a 460 used to haul the daily manure from a 40 cow herd , field was a little soft there was a little hill and a full spreader and third gear yep she melted all six in about two hundred feet . We were able to save the sleeves by useing a rigid hone and some course stones to get the aluim. off But tis tractor is one of then 460 that has had the head off due to burnt valves many times before the low ash came out and that head has been shaved god only knows how many times. Runs great now with 93 in it and will haul the spreader with no issues . It is like this hightest is about twenty cents a gallon over reg. if you use as much as we do it cost use this year around a hundred buck more but normally it is around forty of fifty bucks more over reg. That little extra still does not come close to a repair bill with no labor , now ya want to add in my road labor rate the bill will get ugly . I run the hightest in my S/MTA do i need it ?? probable not but my plugs last longer.My friend Vernon's S/MTA does need it as his is shell we say warmed up a WEEEEEE bit more then mine is as mine will do a good solid 60 Hp. on the dyno and his will do 92 . So for me the tractors get Hightest the War Dept's Durango gets reg. as on it the difference in fuel milage is 1.5 better on hightest then 87 so this does not pencil out Gas milage on the Durango is done everyday because of what the War Dept does for her job .
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