Mitsubishi Hatchback Range

Yes you can. According to the Federal Chamber of Automotive Industry’s guide, all Australian-delivered Mitsubishis with fuel-injected petrol engines built after 1986 can use either E5 (five per cent ethanol) or E10 (10 per cent) safely. By using this fuel, you stand to reduce your tailpipe emissions a little, use a percentage of renewable fuel (ethanol is largely made from farmed crops) and you may even save a few dollars over a year as E10 ULP is often a little cheaper at the pump.

It could be that the gearbox linkages are poorly adjusted, meaning that the gearbox is not fully selecting fifth gear, allowing it to jump into neutral. But it could also be that the selectors themselves are worn or that there’s internal wear inside the transmission that is allowing the gearbox to leap from fifth to neutral all on its own. Either way, it’s a problem that could lead to a range of potentially dangerous situations, so it needs further investigation.

It’s probably worth mentioning that a batch of five-speed manual Lancers made between May and June 2014 were recalled to fix a problem with the gear selectors which could see them suffer gear-selection problems with reverse and fifth gear. Your car, as a 2011 model, shouldn’t be affected by that, but it does seem a bit of a coincidence.

The drive belts on the engines might be new, but what about the pulleys they run in? A pulley with a worn bearing can start to squeal when under load, such as when you start to accelerate and the belt has to speed up. Also, any coolant or oil on the belt can make it screech, too. When the belts had just been replaced, they were nice and clean, but after a few kilometres have passed and contaminants have been able to build up, you might be back to square one again with a screaming rubber belt.

Check the belts for coolant or oil (or anything else) on them as well as the pulleys and tensioners to make sure a small leak in the engine is not being spread all over the place by the belt. Check the belts for correct tension, too, as this can vary over time and is a classic cause of noisy operation. It does seem odd that both cars have started to make the noise in unison, but stranger things have happened.