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For the last few years, I have tried 2 sets of third party HT leads and they have given me problems. I am now using the original leads and the car is fine! Here are the problems the third part leads have caused: MisfiringPetrol brand sensitive caused by the slight misfireThe connectors come off the spark plugs causing the misfireThe inner cable moves easily within the long insulators which causes the previous issueQuality of the cable connectors and fitting at both ends If you have the old 4A-FE, 7A-FE and 3S-FE engines, don't change the HT leads unless you have to. And then try and get genuine or known good quality products. Konrad

The fact that it is one of those very rare "High Grip" Aygo's should fetch quite a premium! ;)

Reading this post it appears some people think that have this gunk that it is only in the filler cap, nooooooo all the top of the engine is coated in it, all over the head bolts and bit by bit it will coat many surfaces. This is caused by short trips and the oil not getting warm enough to dry out the internal condensation within the engine. It will block up breather pipes and eventually wreck the engine. Eventually this emulsified oil is what will attempt to lubricate your engine but it will just seize up. I see some people say use an engine flush and some don't as apparently it's useless, you need to use engine flush to break up this sludge, run the engine for a while as per instructions on the can, do an oil and filter change and hope you have got it all out, just wiping it from the cap is only removing a small amount of this gunk. I even know mechanics that would drain the oil and refill it with diesel and run it for a short while to wash out the sludge, unless you know what you are doing i would not recommend doing this. I suggest you do an oil and filter change using an engine flush and keep an eye on it and be prepared to do it again in say 500-1000 miles, expensive maybe but a lot cheaper than a new engine, or, as David said, get another car and cut your losses whilst it is still running. Regards Mike169

I'm Married I don't pull anymore David

How about the all new Toyota Aygo - no mystery gunk, cheaper, more doors, and pulling-capability...

Ok, thank you.

Yep, fair point, however, if I wanted to charge my car regularly, I would have bought a Nissan Leaf, Chevvy Volt, or a Tesla (if I could afford the $$$).Someone at Toyota seems to have problems with simple physics. A small bucket with a hole in it, with less water going in, than out, will soon be empty. Every time the bucket is emptied, it is damaged, and holds less water, so empties sooner. Mr T, is that so hard to understand? G...