Technical Queries

Rustproofing – a stitch in time…


  1. Posted on August 10th, 2021 by Rob Marshall
  2.   Cars do not rust like they used to, so many people claim. In the main, they are right; rust holes are not common on five-year-old vehicles any more. Improved metal, galvanising, sealing and painting have improved matters immeasurably but rust has not been stopped in its tracks entirely, especially as many car manufacturers do […]

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Faults: Keep calm but don’t carry on


  1. Posted on August 3rd, 2021 by Rob Marshall
  2.   Many people are at a loss when a dashboard warning light appears suddenly. To an extent, this is understandable, because the meaning of many symbols can be far from obvious. Even owner handbooks tend not to be very helpful. Yet, any dashboard warning should not be ignored and, should one appear, it is a […]

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More on ‘pongy’ air conditioning


  1. Posted on July 14th, 2021 by Rob Marshall
  2. Especially relevant during the pandemic, anything we can do to prevent illness has to be a good thing. One common complaint is ‘smelly air conditioning’, where activating the air conditioning produces an unpleasant temporary stench.   The odour originates mainly from the evaporator, which is the coldest part of the air conditioning circuit  – think […]

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E10 – unless you drive diesel, or fully electric, you will be affected


  1. Posted on July 6th, 2021 by Rob Marshall
  2.     As you may have heard from the mainstream media, E10 petrol is due to hit UK forecourts in September. This will see up 10% ethanol added to regular 95 RON, instead of the present <5% content (E5). In this introductory blog, GEM shall tackle some of the most common questions that our members have […]

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Call for stricter diesel emissions MOT Tests for illegally tampered diesels


  1. Posted on June 24th, 2021 by Rob Marshall
  2. The Westminster Commission for Road Air Quality (WCRAQ) is calling for the MOT to include a diesel particulate filter (DPF) efficiency test, in a bid to rid UK highways of cars that have had their anti-pollution systems tampered with illegally.   DPF trap carbon particulates, which are known carcinogens, hindering them from being expelled into […]

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New Tyre labels – two for one?


  1. Posted on June 10th, 2021 by Rob Marshall
  2. Should you plan an imminent tyre purchase, you may notice that the tyre label has changed. Following concerns that tyre purchasers are unaware of the differences between the highest and lowest wet grip and fuel efficiency ratings, the fuel label was revised. Retailers are also obliged to provide this information, so ensure that you have […]

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Why your car needs a spring break – Part 5


  1. Posted on April 21st, 2021 by Rob Marshall
  2. While recent GEM technical blogs have looked at why the 12-volt battery, engine oil, exhaust and emission controls can be affected by cold weather, infrequent use, and/or multiple short journeys, they are not alone. Therefore, the final part of our post-lockdown checks include components that are worth either inspecting from home, or having a garage […]

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Why your car needs a spring break – Part 4  


  1. Posted on April 9th, 2021 by Rob Marshall
  2. In our fourth instalment, looking at how cars suffer from infrequent use and what can be done at service time, Rob Marshall focuses on exhaust emissions that can hit your wallet hard, if they cause a post-lockdown MOT Test failure.   The topic of exhaust emissions is immensely complex. While you can read much on […]

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Why your car needs a spring break – Part 3


  1. Posted on April 1st, 2021 by Rob Marshall
  2. In the third part of looking at how cars suffer from infrequent use, Rob Marshall focuses on the exhaust system   While exhaust systems are out-of-sight, they should not be out of mind. Their main enemy is corrosion. With last winter being somewhat colder than usual, much of the country saw plenty of road salt […]

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Why your car needs a spring break – Part 2


  1. Posted on March 24th, 2021 by Rob Marshall
  2. In the second part of investigating how cars suffer from infrequent use, Rob Marshall focuses on engine oil   It seems illogical that low-speed short trips are tougher on many parts of a car than longer commutes but this is especially true with engine oil.   Oil quality is essential to long engine life. Not […]

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