635csi 95 unleaded

[ROBERTIAN]

Should I use 95 unleaded petrol in my 1981 635csi?

 

[CLASSICMAN]

Should I use 95 unleaded petrol in my 1981 635csi?

My understanding is that any old car with an aluminium cylinder head will be able to run unleaded without any problems as the ally heads already have harder valve seats in them. The cars with Cast Iron heads are the ones that have to run on LRP or have the heads modified to run unleaded. If this is correct, then you should be fine running on either

 

[Clownshoe]

Interesting... I have been agonising over which fuel to use.

 

[NewB MW]

So this thread had its last activity nearly a year ago...What petrol have you been using and how is it going?

 

[Wes]

Should I use 95 unleaded petrol in my 1981 635csi?

My understanding is that any old car with an aluminium cylinder head will be able to run unleaded without any problems as the ally heads already have harder valve seats in them. The cars with Cast Iron heads are the ones that have to run on LRP or have the heads modified to run unleaded. If this is correct, then you should be fine running on either

+1

I run mine on 95, without any hassle.

 

[skank]

Same here.

 

[symmat001]

Hi Guys

I've got an early 1985 528 , essentially the same m30 engine, but does mine have an aluminium cylinder head?

 

[Peter@AEW]

Hi Guys

I've got an early 1985 528 , essentially the same m30 engine, but does mine have an aluminium cylinder head?

yes

 

[Clownshoe]

BMW service bulitin re. unleaded in M30 engines

Post 8/84 engines have hardened valve seats. Pre 8/84 engines are OK as long as they have done 60,000km on leaded so the valve seats are now conditioned to take unleaded.

---

I sometimes used LRP and now I just use straight unleaded.

 

[moranor@axis]

NF 3ron octane boost contains a lead substitute to protect valve seats...

 

[Sabretooth tiger]

NF 3ron octane boost contains a lead substitute to protect valve seats...

My cousin does this in his late dad's Audi100 as well.

 

[moranor@axis]

NF 3ron octane boost contains a lead substitute to protect valve seats...

My cousin does this in his late dad's Audi100 as well.

i dont even trust that LRP is LRP most of the time :fencelook:

 

[rodga]

Didnt want to start a new thread...

but want to check what fuel is fine to on a 1983 e12/8 528i
95 ULP?

Just came across lots of conflicting info and would liek to double check

 

[Luis Malhou]

Should be fine on either, 95 just keep an ear out for pinging, octane might be a little high for that car. I use only 93 in my 530 1976 with no additives or issues

 

[rodga]

Thanks Luis

How do i opent he bonnet? I had a quick look yesterday and could find the bonnet release handle?

 

[Luis Malhou]

If memory serves me right.. passenger side, i think with cubby hole open.. remember the hood doesn't pop on the front but at the windscreen. You then need to lift it up. The lever only release the lock.. when closing you put the bonnet down and push the lever and it pulls the bonnet into the lock position
:tiptoe:

 

[Clownshoe]

If memory serves me right.. passenger side, i think with cubby hole open.. remember the hood doesn't pop on the front but at the windscreen. You then need to lift it up. The lever only release the lock.. when closing you put the bonnet down and push the lever and it pulls the bonnet into the lock position
:tiptoe:

Ah yes. I was not quick enough to stop a salesman slamming the bonnet on a 635 i was looking at. :RedNo: