just checkin wot fuel to use in my G-plate sapphire cosworth. i was told super unleaded, optimax and BP ultima but last nite i was told by a lad that the red rocker cover engines were supposed to run on LRP. is this right. the cars previously had the headgasket done so didnt no whether the valve stem seals would have been renewed to run unleaded if this is true. pleas. any help would be great.

dave

 

super or optimax m8 they was desinged to run leaded 4**** m8 but they have the same octane rating m8 lrp is useable but not ideal

 

As said, cos cossies have hardend valve seats they can run on either, obvoiusly before they ran on leaded but as soon as super etc came out they advanced the ignition to make it work on unleaded, but super or optimax is best or will run like a bag of shite, and cos super etc have a higher octane their better anyway

Dont think valve stem seals makes a difference as far as i know they've always been the same but could be wrong.

Thats why you have red top for the older ones (leaded originally) and green tops fro the later ones, althou that sometimes they varied from the factory they were assembled at.

 

thats brilliant. ccheers lads. just got a bit paranoid as its me 1st cossie and i dont really wanna fuck it up. thanx again

dave