I have had to rebuild the bottom end of my 87 cossie , due to a big end letting go on me. The engine is running a stage 1 , about 280bhp . The oil that i have been using is the ford oil 0w40 fully synthetic , can anyone suggest any other oil or what i should be using .

Many thanks

Dave.

 

How long have you been running it on that for? If it's not long, then get some mineral oil in there for at least 500 miles..

 

Don't tell us you have been using a synthetic oil in a new engine!!
tabetha

 

0w-40 far to thin for cossie once u have run it in i woud go for either 15w-50 mobil 1 motorsport or 10-60 pro stuff

 

No im just getting ready to re fit the engine

 

You've been using 0w-40 on a Cossie, and you wonder why the big end let go??

 

The man that does the work on it has a grpN cossie rally car that is what he was putting in it its 5w 40 he was using , so any advice!

 

you need you use mineral oil if its new build; then after the engine has ran in you need to swap it for 10-50 silkolene pro s

dont use 0-40!!!!

 

As said MINERAL for first 2000 miles, DON'T baby the engine either, you can after that use 10W40, BUT I wouldn't, as it gets too thin when hot, it will work ok just use a lot of oil in comparison to a heavier weight oil, will give a fraction more power(possibly), good for a group n, but not road car, use a 50 weight.
tabetha

 

Ok lads thanks for the advice

 

I use 5w-50 mobil 1. Is it good? Before I have use casrol 10w-60...

 

Yeah it's fine.. just dont use 0w40.

 

silkolene pro S 10-50 is the best to use on a run in engine

 

i use silkolene pro rs 10/50.

 

In Ukraine I cant find silkolene oils

 

Castrol uk are saying to use 10w 60 edge sport or alternative 10w 40 magnatec whats your opinion on that

dave.

 

as I know 10w 40 magnatec is semisintetic....