DIY oil change at home: real savings or needless risk

Changing your oil at home: when the savings come at the cost of safety

Changing your car's oil yourself costs between 77 and 111 euros with brand-name filters. At a garage, the same job with a budget product can top 200. The difference is real. The problem is that most of the time it isn't measured in euros, but in centimetres of clearance under the sump, in badly placed axle stands and in litres of used oil that end up where they shouldn't.

The question that opens the debate isn't whether it's worth it, but how you lift the car without it falling on top of you. And there, the answers range from the jack and the spare wheel to the suction pump, not to mention wooden planks cut to size.

Jack, axle stands or wooden ramps: what experience says

The most common method is also the most precarious: lifting with the jack and sliding the spare wheel underneath. It works if the sump plug is accessible from the front, as is the case with many small cars. Some people say they didn't even need to raise the vehicle: the bolt was at wheel height and came out "nice and easy".

For those who need more room, there are Lidl axle stands —when there's an automotive sale— and wooden blocks. One case describes six blocks of 40x12x24 centimetres cut from a railway sleeper, three per side, enough to slide underneath "more or less relaxed". Another prefers homemade ramps made from two planks bevelled into a wedge: 15 centimetres of height and, according to their maker, safer than sheet-metal axle stands.

The technical consensus is clear: the car must be on level ground when you position the jack, and level when draining the sump so no oil is left pooled in a corner. While you're removing the bolt, the position doesn't matter. Afterwards, the vehicle goes back on its wheels.

How much do you really save compared to a garage?

The figures circulating in the discussion vary widely and deserve a close look. One breakdown: 45 euros for 6 litres of Castrol EDGE 5W-40, 13 for the fuel filter, 13 for the air filter, 6.5 for the oil filter and 16 for the pollen filter. Total: 111.5 euros. The same job at a quick-service chain, according to that calculation, would come close to double.

At the other end of the scale, some pay 35 euros for an oil and filter change with product included at a neighbourhood garage, and others find labour for 25 euros if they bring their own supplies. The recurring conclusion: if the oil is high-end and the engine takes six litres, there are savings; if it's ordinary oil and the car uses four, the margin narrows until it disappears.

The variable almost nobody factors in is time. An hour of your own work, tools that have paid for themselves and the risk of getting dirty. One calculation sums it up: saving 100 euros in an hour is worthwhile. Saving 20 every 20,000 kilometres is not.

The suction pump and the tilted sump debate

Against the traditional method, the extraction pump is gaining ground. A 12-volt model moving 1.2 litres per minute is advertised as the solution for anyone who doesn't want to crawl under the car. The promise: extract the oil through the dipstick tube in fifteen minutes.

The rebuttal comes quickly. There are sumps whose shape leaves oil behind when drained by gravity, because the plug isn't at the lowest point. And there are those who claim the opposite: that the pump reaches where the bolt can't. The debate remains open. What is clear is that the oil filter is still located underneath in most engines, so lifting the car remains necessary at some point.

Where to do it: from your own garage to a rented workshop bay

The middle-ground option is rented workshop bays. For 15 euros an hour —18 in some cases— you get access to a lift, tools and a tank for the used oil. In an hour and a half you can change the oil and all the filters. The problem is location: in Madrid, as people lament, they're scarce. Getafe or similar towns are the usual destination.

There's also the recycling centre. Doubts about whether the oil is actually recycled come up in the conversation, and the answer is yes — but the habit of tossing it in the blue container —the one for cardboard— shows the information doesn't always get through. Used oil is hazardous waste and its proper destination is the recycling centre or the workshop bay itself.

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The job goes well when the plug is accessible, the ground is level and the oil ends up where it should. It goes badly when the wind brings the bonnet down, bends the support bar and ruins a pair of trousers that are only fit for the building site from then on. Is the saving worth it for someone with no lift and no garage?