hey leuties recently I noticed that my engine is making a very funny noise, it sounds like the engine is kind of hard to run, it’s no click or something like that! It’s really bad when the engine is cold, it also stutters a little and doesn’t level up, yesterday it even went off after starting (cold engine) and then jumped again after about 10min!!! maybe it’s the thing that I’m using the wrong oil to start the summer. can you help me solve the problem????? and 5W 30? can you help me solve the problem??? what can that be??? Vehicle data: escort ghia 1.6 16V Zetec with 90 ps 9/1992 achso and I noticed that since the sprit consumption has increased somewhat!!!