I'm using castrol magnetac, but it doesn't just make a noise on start up even when you drive it makes a noise somebody told me it might be the timing sensor that are dirty is that correct. tx again for all your help
Tx vader and jack just to come back to the first question I had about The ICV I did cleaned it today the car are idling much better but not 100% yet I think it might be faulty, Then the 2nd Question castrol magnatec are made by shell fuel company apparently its very good according to the experts. Just to update quickly I live in south africa, then main thing I did cleaned the timing sensor today but it made no difference to the noise. JACK i did check all the air hoses but did not check the manifold gasket yet can that also affect the timing> ANOTHER QUESTION GUYS MY CAR ARE A 1994 E36 M40 WITH A TIMING BELT AND NOT THE CHAIN DOES IT HAVE A CO2 SENSOR AS I CAN'T FIND ONE ANYWHERE ON THE EXAUST SYSTEM tx guys
It should have an O2 sensor. Being OBDI it should only have one sensor, which should be before the catalytic converter. It will stick off sideways not down so it may be slightly difficult to see.
Castrol is the OEM supplier of oil in BMW engines. However only certain viscosities are approved by BMW. The BMW LL-01 list is the official list of approved oils. Castrol 0w-30 and Mobil 1 0w-40 are to top two on the list (out of four). I'm not familiar with Magnatec but check the viscosity rating. I'm not gonna blast you for not using an LL-01 approved oil, as several other oils meet the same standard, but depending on what your using now trying a lighter viscosity may help with the noise. You have to change your oil anyway, may as well do something that in essence won't cost you any more then you already have to spend.
It may be the slave cylinder. But you should also replace the master cylinder. Its best to replace them in pairs ideally. The slave cylinder is bolted to the transmission. You have to jack the car up and get under it to replace the slave cylinder. You have to bleed the system properly afterwords. You have to install it properly so the plunger doesn't shoot itself into the bell housing the first time you push the clutch pedal down (possibly requiring the transmission to be dropped).
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