Hey, so my ford escort mk1 57PS 1971 , 1300 is now finished. I filled in Meguin Megol when changing oil 5W40 because I had it at home… Is that excessive or even harmful? Before 15W40 was inside. Maybe he’s sweating something out of the cylinder head gasket now. minimal! But I didn’t drive with the 10 year old 15W40 either. He’s stood up for 10 years;he’s put back into operation this year. I’ve read some excerpts from the oil thread. From there I thought the 5W40 kan n actually not being too thin for the engine…