BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

Engine oil can be changed by winter. And whether it is necessary? Certainly and, if now in a case of your car oil summer laps: the frost will strike and it will cease to lap, will freeze. There will be problems. But if you use all-weather oil, then to change it only because winter is at hand, it is not obligatory at all. The main thing not to go by one oil gas station longer than put. It is told in the service book of the car to change oil through N thousand km of a run – change through N.

Cheap but good or expensively yes it is lovely?

Immemorial question: mineral water or synthetics? Than oil synthetic – ftoruglerodny, diradio, silicone, polyalkylenglycoleft – on the properties, of course, it is better mineral (oil). First, at synthetic there is much lower than temperature of hardening. Secondly, with change of temperature at them viscosity changes less, and that is very important, they are not diluted at very strong heating. Thirdly, they evaporate less and burn out. Fourthly, form less deposits polluting the engine: deposits, varnishes and slimes (ointments). Fifthly, their resource of times in five above, than mineral. Sixthly, when using synthetics less mechanical losses in the engine and wear of details. The list of advantages can be continued still points on ten. Only one shortcoming – the price. Synthetic is more expensive mineral by three-five times. Serious blow to a purse. If synthetics is heavy for a pocket, and you essentially do not recognize mineral water, buy semi-synthetics - it is quite reasonable compromise.

In a consolation house-keepers should notice that mineral oils in itself are not bad at all. If synthetics – it is expensive yes lovely, then mineral water – cheap but good. A century went by mineral water and, probably, even a century will go. By the way, in the old car guzzling oil it does not make sense to fill in synthetics: oil and money take off for an exhaust pipe; on a dolivka it is possible to be ruined. Remember that to mix mineral oils with synthetic it is impossible. It is possible to change mineral water for synthetics (and vice versa) without problems, it is necessary only between them minutes twenty to drive the engine on special flushing oil.

Read from 35

Oils classify by two nominations: on viscosity and on quality. Viscosity. The international scale of SAE provides 11 classes of viscosity. Six winter: 0W, 5W, 10W, 15W, 20W and 25W (W – winter, winter). And five summer: 20, 30, 40, 50 and 60. All-weather grades designate double marking, for example, 15W-40 or 10W-30, etc.

Not to make the wrong choice of oil by winter, it is useful to remember the so-called rule 35. It is necessary to subtract a winter index of viscosity from number 35 – receive the extreme temperature of pumpability of oil. For example, oil 10W-40 (the summer index does not play 40 roles) keeps fluidity to-25 degrees Celsius (35 – 10 = 25).

The rule 35 is ideally applicable to mineral water, but, unfortunately, is suitable for synthetics assessment a little – it has absolutely special viscous and temperature characteristics. So, for example, synthetics of a class 10W-40 can be calculated also on-50. In general, synthetics is always colder than mineral water of the same class of viscosity therefore with it it is almost impossible to be mistaken (and to freeze). Quality. In our market it is often specified on the American scale of API. Oils are divided into categories: S – for petrol engines and C – for diesels. If oil universal (it suits both those, and others), then it is designated by a fractional index where in numerator – preferable type of the engine. Following S or C letter (or a letter with figure) means actually quality of oil. Today on API petrol oils of level of quality of SH and SJ are the best; diesel – CG4 and CH4.

Europe now even more often uses a new scale of quality – ACEA. On it petrol oils are designated by a letter A (the highest on quality – A3), and oils for automobile diesels – a letter B (the highest – B3).

Several councils. In the worn-out engine where oil the viscosity one class higher recommended is better to pour gaps into a finger through which fuel gets to a case. Similarly – if the engine is inclined to overheating. The class of quality of oil for any motors new and old, has to be not lower stipulated in the service book. Above – it is possible (therefore we also specified only the highest classes).

And main thing. Buy oil only in shops with good reputation. Our wild market abounds with the skilly in beautiful jars made it is unknown where also whom. Do not peck on invitingly cheap. Free cheese, as we know, happens only in mousetraps

Autopilot