MISSED BY THAT MUCH
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.
PLEASE RELEASE ME
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.