Oil change fre­quency

Car Mechanics (UK) - - Help! -

I have a 1997 Mercedes-benz C180 au­to­matic with 129,000 miles on the clock, which I've owned for the past eight years. I change the oil and fil­ter ev­ery 3000 miles, along with the trans­mis­sion fluid (but not the fil­ter). I also use an en­gine re­storer/lu­bri­cant. The oil I gen­er­ally use is Cas­trol 10W-40/15W-40, but I have now changed it to Shell Helix 10W-40 syn­thetic HX7 (MB ap­proved 229.3).

The ve­hi­cle has not had any ma­jor prob­lems. The last is­sue was a faulty crank sen­sor and the tem­per­a­ture sender has also been re­placed. The ra­di­a­tor was changed af­ter the lugs broke, but my lo­cal garage says this is a com­mon fault.

My garage says I do not need to change the oil and fil­ter, along with the auto fluid, ev­ery 3000 miles. What is your opin­ion? A Wray

While chang­ing the en­gine oil at 3000-mile in­ter­vals will not do any harm, mod­ern oils will cer­tainly cover a much greater mileage be­fore any de­te­ri­o­ra­tion will take place. You do not men­tion your an­nual mileage, but the time fac­tor should also be taken into con­sid­er­a­tion, and chang­ing the oil an­nu­ally even at 3000 miles would not be con­sid­ered ex­ces­sive. How­ever, I would be less in­clined to re­place the trans­mis­sion fluid at such reg­u­lar in­ter­vals. Al­though this should do no harm, the ben­e­fits would be min­i­mal.

Given such reg­u­lar oil changes, I would be less in­clined to add a re­storer in the en­gine oil, in case the cu­mu­la­tive ef­fect of the prod­uct be­gins to be­come detri­men­tal to the en­gine. You do not men­tion which prod­uct you use, so I can­not com­ment on the ef­fects of this.

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