///BHRpowered Posted May 18, 2008 Report Share Posted May 18, 2008 So the other day I was at Mazda picking up a part and some nonmale was in there picking up a cx-7 from an oil change, and naturally bitching about gas prices, now the tech talking was one I have had experiance with and general knows his stuff, he said that although it requires premium the best thing to do is run a full tank of prem through every 3rd fill up, and run regular the mid grade the rest of the time. bullshit I say. Quote Link to comment Share on other sites More sharing options...
AngelOfDeath Posted May 18, 2008 Report Share Posted May 18, 2008 this was told to me one time while i was in south florida dealership.....bullshit completely .... my father even mention it ...i was like ummm no , it's what it requires! Quote Link to comment Share on other sites More sharing options...
///BHRpowered Posted May 18, 2008 Author Report Share Posted May 18, 2008 I know ren will be along thinking you should always run regular because it doesn't matter and blah blah blah, to bad your mileage decreases, power decreases, gunk increases. Quote Link to comment Share on other sites More sharing options...
enginph Posted May 19, 2008 Report Share Posted May 19, 2008 I got 91 this time since its getting hot here. I will start mixing 89 and 91.. Good fuel will not cause gunk, lower octane is more power when its not hot. Quote Link to comment Share on other sites More sharing options...
AngelOfDeath Posted May 19, 2008 Report Share Posted May 19, 2008 i dunno about that... got proof ?? Quote Link to comment Share on other sites More sharing options...
enginph Posted May 19, 2008 Report Share Posted May 19, 2008 i dunno about that... got proof ?? proof of? Mazda already posted a service bulletin that says high octane gunks up 2.5 engine and should be avoided if a high octane user complains engine knock. Quote Link to comment Share on other sites More sharing options...
ing-schu@online.no Posted May 19, 2008 Report Share Posted May 19, 2008 Never ending discussion this one... I run 95 RON in my 2,5, that is what you call midgrade I guess. It is what my engine is supposed to have, and it works for me. I believe carbon buildup has more to do with how you use the car than what fuel you run. Same old story, avoid short trip driving and you're fine. That is what causes all kinds of problems including carbon buildup. Just my opinion. The CX-7 has the 2,3 turbo engine right? In theory running lower octane will do no harm but make you loose power due to retarded timing to avoid engine knock. At least when gunning it. This is how it works on Saabs anyway. They've built turboed cars since 1976. Soccermums would never notice powerdrop during their leftlane while putting on lipstick driving. Quote Link to comment Share on other sites More sharing options...
///BHRpowered Posted May 19, 2008 Author Report Share Posted May 19, 2008 I partly agree with xedos thats its the way its driven, a granny drivn car will have more, logner trips, and people who use all the revs are much less likly to have any build up, when I use to go to autothority when they were servicing my millenia next to ferrari's the techs would recommend high speed cruising above 100mph for a few minutes every few months, the increased substained revs does wonders for knocking out any buildup and keeping things running smooth. Quote Link to comment Share on other sites More sharing options...
ing-schu@online.no Posted May 19, 2008 Report Share Posted May 19, 2008 Yup. I opt for revving north of 5k every day. Once warm. It pleases both my ears and my engine Quote Link to comment Share on other sites More sharing options...
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