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Buying tips

BMW engine compression tests: what the numbers mean

Compression tests at our Hamburg yard

How we use compression and leak-down tests in Hamburg, and what you should ask for.

  • BMW compression test
  • engine leak down
  • used engine check

Also searched as bmw engine test, compression check bmw.

In short

Compression tests real photo 1

We check engines before we pack them. Even compression on all cylinders matters more than one high number.

A leak-down test helps when we ran the engine on the stand.

Will it fit my car?

Compression tests real photo 2

A perfect test on the wrong code is still the wrong engine. Tests never replace the VIN check.

What we check

Ask for the numbers if they are not on the page. Look at the gap between cylinders, not just the top number.

Oil pressure notes, if we took them, go in the same file.

How to pick the right engine

Pick engines that show their test notes. Grade A or B on a page comes from those notes.

Warranty

Many engines come with up to 12 months warranty. A proper workshop must fit the engine. The warranty is for a fault inside the engine. It does not cover the wrong engine, a dry start, the wrong oil, or damage done after you open the crate.

Shipping

Crate shipping from Hamburg costs 299 EUR. We pack the engine in a strong crate and send it to the address on your order. You need a forklift or an engine crane to unload it.

FAQ

Do you ship compression tests to my door?

Yes. Crate shipping from Hamburg costs 299 EUR to the address on your order.

How long is the warranty?

Up to 12 months on many engines, for a fault inside the engine, after a proper fit. See the warranty page for the full rules.

Are the photos of the real engine?

Yes. When you buy Bayerische Motoren Werke engines from us, the photos are real photos from our yard, not made-up pictures.

Can you check my VIN first?

Yes. The VIN check is free. Send it before you pay and we confirm the engine fits.

See checked enginesFree VIN check

Further reading