Grundig filterrens så vel som riktig avriming bidrar til lang levetid.

Så vel som means as well as.

In this sentence, it links two things:

• grundig filterrens
• riktig avriming

So the structure is:

• X så vel som Y bidrar til ...
• X as well as Y contributes/contribute to ...

A useful thing to know is that så vel som is a little more formal or written than everyday og. It is not exactly wrong to think of it as and, but as well as is usually the best match.

Bidrar is the present tense form of the verb å bidra.

• å bidra = to contribute
• bidrar = contributes / contribute

So:

• ... bidrar til lang levetid = ... contributes to a long lifespan

Norwegian present tense verbs usually end in -r:

• å komme → kommer
• å hjelpe → hjelper
• å bidra → bidrar

This is a very common learner question.

The phrase så vel som does not work exactly like a plain plural and in all cases. It often behaves more like an added side element: X, as well as Y, contributes ...

So the verb often agrees with the first/main item rather than becoming clearly plural.

That is why bidrar works naturally here.

Also, in Norwegian present tense, bidrar is the same form whether the subject is singular or plural, so you do not actually see a difference in verb form the way you would in English with contributes vs contribute. The important point is that the sentence structure treats så vel som a bit differently from a simple og.

Yes. Filterrens is a compound noun, and Norwegian uses compound nouns very often.

It is made from:

• filter = filter
• rens = cleaning / cleansing

So filterrens means something like:

• filter cleaning
• cleaning of the filter

English often writes these as two words, but Norwegian commonly writes them as one word.

This is extremely normal in Norwegian:

• bilmotor = car engine
• vaskemaskin = washing machine
• levetid = lifespan

Avriming is a noun meaning defrosting or de-icing.

It comes from the verb:

• å avrime = to defrost / de-ice

Here the sentence uses nouns for both actions:

• filterrens
• avriming

That creates a neat, formal style. English does this too:

• thorough filter cleaning as well as proper defrosting contributes to ...

So instead of saying å rense filteret og å avrime, the sentence turns the actions into noun phrases.

Because filterrens is singular indefinite, and the adjective before a singular indefinite noun is often in the basic form.

So:

• en grundig filterrens = a thorough filter cleaning

Compare:

• en grundig vask
• en grundig kontroll

You would get grundige in other patterns, for example:

• den grundige filterrensen = the thorough filter cleaning
• grundige kontroller = thorough inspections

So in this sentence, grundig is exactly what you would expect.

For the same reason as grundig filterrens.

Avriming here is also being used as a singular indefinite noun, so the adjective stays in its base form:

• riktig avriming = proper/correct defrosting

Compare:

• riktig bruk = proper use
• riktig behandling = proper treatment

But:

• den riktige avrimingen = the correct/proper defrosting
• riktige metoder = correct methods

After å bidra, Norwegian normally uses the preposition til.

• å bidra til noe = to contribute to something

So:

• bidrar til lang levetid = contributes to a long lifespan

This is just a verb-preposition pattern you need to learn as a unit:

• bidra til bedre helse
• bidra til vekst
• bidra til et godt resultat

Levetid means lifespan, service life, or length of time something lasts.

It is another compound noun:

• leve = live
• tid = time

In this context, it usually refers to the useful lifetime of a product or machine, not the lifetime of a person.

So lang levetid means:

• long lifespan
• long service life
• long durability (depending on context)

No, it is not missing anything.

In Norwegian, it is very common to leave out the article in general statements like this.

So both of these are possible in different contexts:

• bidrar til lang levetid
• bidrar til en lang levetid

The version without en often sounds more general, compact, and natural in informative or instructional writing.

This is similar to how English sometimes says:

• contributes to long life instead of
• contributes to a long life

Yes, it sounds natural, especially in instructions, product information, or technical writing.

The things that make it sound a bit formal or informational are:

• så vel som
• noun-heavy phrases like filterrens and avriming
• the general style of bidrar til lang levetid

In everyday speech, someone might say something simpler, such as:

• Grundig rengjøring av filteret og riktig avriming gjør at det varer lenger.

That is less compact and more conversational.

Yes, you often could.

For example:

• Grundig filterrens og riktig avriming bidrar til lang levetid.

That is simpler and very natural.

The version with så vel som is a bit more formal and can put slightly more focus on the first item, with the second added alongside it.

So:

• og = plain and
• så vel som = as well as, somewhat more formal

Because Norwegian often prefers compact compound nouns and nominal style, especially in written informational language.

So instead of:

• grundig rensing av filteret it can say:
• grundig filterrens

And instead of:

• å avrime riktig it can say:
• riktig avriming

This makes the sentence shorter and denser. That style is very common in manuals, product descriptions, and technical recommendations.