Performance Vauxhall - - TECH -

You may not re­alise it, but fuel ‘goes off’. Some fuels ex­pire faster than oth­ers. Many of you will have ex­pe­ri­enced or heard of cars re­fus­ing to start af­ter be­ing left mo­tion­less for long pe­ri­ods of time. In most cases, this is be­cause oc­tane lev­els in the old fuel have dra­mat­i­cally dropped.

Gen­er­ally speak­ing, due to the evap­o­ra­tion of the chem­i­cals used in them, higher oc­tane fuels lose their po­tency faster than lower oc­tane fuels. Even premium un­leaded pump gas is said to be past its best if left in a car’s fuel cell for more than a fort­night!

When deal­ing with an engine op­er­at­ing near its det­o­na­tion thresh­old, run­ning old fuel can be a se­ri­ous prob­lem, so try not to leave petrol in hi­ber­nat­ing cars.

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