The Northern Star - - MOTORING - Les Town­row, email


Re cold start pis­ton slap noise in the Gen­eral Mo­tors LS3 al­loy V8. My 2015 Holden Caprice was muted some­what by us­ing ethanol E10 blend fuel. A sen­sor in the tank sig­nals to the en­gine con­trol unit to re­duce ig­ni­tion ad­vance, which in turn qui­etens pis­ton slap un­til the en­gine reaches op­er­at­ing tem­per­a­ture. Garry Hen­der­son, email In­ter­est­ing find­ings, Garry. Per­son­ally, I avoid us­ing E10 in any en­gine but if pis­ton slap from your GM V8 is driv­ing you mad, it’s worth a try.


I have a 2017 Mazda MX-5 that doesn’t have a spare wheel but in its place there are a can of goo and a small com­pres­sor. I’ve heard you use the goo to get mov­ing again but tyre places then can’t re­pair the punc­ture. Is this cor­rect? Brett Wake­man, email As long as the tyre hasn’t been dam­aged be­yond re­pair, us­ing goo or sealant won’t pre­vent a fix. The sealant leaves a mess in­side the tyre which has to be cleaned out, so some tyre shops may charge more or refuse if they can’t be both­ered.


I’ve been try­ing to buy a Mercedes-Benz C300 for some time and can­not get any in­for­ma­tion on it. I’ve con­tacted three deal­ers and they’ve all been tight-lipped about it. There have been ship­ments of C300s at the docks since July. Can you shed some light on the cause of the prob­lem? Tony Mar­letta, email A Mercedes-Benz Aus­tralia spokesman says: “We are cur­rently ex­pe­ri­enc­ing a de­lay in cer­ti­fi­ca­tion for C300 mod­els and ex­pect to re­lease any ve­hi­cles in the coun­try be­fore the end

of the year. This will de­pend on a num­ber of fac­tors such as tim­ing of ve­hi­cle or­der and ar­rival in coun­try.” Per­haps you could test the cheaper C200 while you wait. It’s not as quick but has ex­cel­lent spec­i­fi­ca­tion.

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