How rare?

[nando]

Be ready to rebuild the motor. Because the sulphur in gasoline corrodes the head, because the sulphur reacts with the nikasil head.


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it's the block, not the head, and that was the M60, not the M70. there was never a nikasil head.

the M70 block is cast iron.

also, even then it depends on where the car is from. refineries in different areas had different compositions, including sulfur content. Sulfur content in today's fuel is also a lot lower than it was in the early 90s due to more regulation and better processes.

[freeride53]

The one you want is an 840

[HennaE30]

it's the block, not the head, and that was the M60, not the M70. there was never a nikasil head.



the M70 block is cast iron.



also, even then it depends on where the car is from. refineries in different areas had different compositions, including sulfur content. Sulfur content in today's fuel is also a lot lower than it was in the early 90s due to more regulation and better processes.

Yea it had been awhile since I had read about it.. The cylinder liners were Nikasil, and the gasoline caused them to breakdown


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[bastianshaw]

The v12 engine (m70) is basically two m20's fused together.

Prepare to have extra ordinarily deep pockets to maintain/work on this engine.

It's controlled by two "banks".

Basically two if everything, meaning one for each bank.
Google bmw m70 engine and you'll see what I mean.

People always say this but I own 2 e30s so im already maintaining 2 m20s (not uncommon these days)