Lubricating Guide

A greater oil pressure indicates a better lubrication?

Not necessarily. This is why, as to indicate if there is sufficient pressure, vehicle manufacturers place a light indicator that ensures the minimal necessary for the lubricating system to run with ease.

With a SAE 40 will I have get a higher pressure than with a SAE 30 ?

No, an increase in pressure reading may be detected, but that is not indicative of a better lubrication, because when the engine is started, it is cold, and a more viscous oil (higher SAE number), will be harder to pump, reason why it will reach the farther zones of the engine, which translates into more wear and tare.

A multigrade lubricant seems less viscous, those this means that its lubricating capacity is not good?

No, it is the contrary. The previous answer is what led the international automotives manufacturers to recommend multigrade lubricants, such as Repsol Elaion (15W-40, 10W-30 and 5W-40) or Diesel type Repsol Extra Life Plus(15W-40), which at the time of the boot-start, the most critical of the operation, quickly reaches higher areas on the engine, thus beginning to decrease wear and tare in this part. Then, when in full regime, they are much more viscous than a SAE 40, although such a change is not detected by normal gauges.

Can lubricants be mixed?

All lubricants were developed thinking of the possibility to be mixed with other lubricants of all other known brand, regardless of the API quality level.

Can I use a lubricant with detergents in an engine that always functioned well with a common lubricant?

Yes, no doubt. It is recommend that engines which used lubricants with no detergents- dispersers or of low detergent contents in same, after first lubricant and filter change, to perform lubricant change at a lower kilometer reading than usual.

Why does the lubricant gets darker after it is used?

Dirty Lubricant = Clean Engine. This refers to well-maintained vehicles. A high quality lubricant works immediately, maintaining grunge, dust and all other pollutants in hold, and thus preventing its accumulation in critical areas. This quality causes lubricant to appear as dirt in a matter of hours, which is particularly noticeable in Diesel engines. Lower quality lubricants, which are not capable of performing what has been described, remain "clean", at the expense of soiling the engine.

When should I change lubricant?

When your engine´s manual instructs you to so do. However, for a greater insurance of those engines and equipments that use Repsol Lubricants, our lubricants are able to exceed estimated life expectancy given by the manufacturer.

Is there any benefit in adding extra additives to lubricant

None. Repsol Lubricants already have the exact balance of additives to overcome performance required by all Engine Manufacturers. In opposition, adding additives to lubricants not only may unbalance engine, but very likely will seriously harm the engine that is being desired to protect. Therefore, automotive manufacturers select the appropriate lubricant for each engine model, after demanding tests and trials, both in laboratories as in the field, and do not recommend in their manuals any addition of any strange additives.
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