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You generally want to warm up forged piston engines as they expand with heat.
Short journeys as a daily can cause wear and oil blow-by.
See how it sounds when you start it up, sometimes get a rattle noise from piston slap (but that's usually on boosted setups with bigger clearances)
From what i've seen of Synergy Lite, it looks really easy wipe on in crosshatch pattern and then remove with a short pile cloth.
Ordered some myself to try.
Yeah i bought my lot a few times when the offers were on.
Don't seem to do them now, it was more when they were trying to get their name out a bit more.
RC6 have the most stopping power out of those.
I've used CL's in the past but stopped using them because they kept falling apart.
Ran the PBS for a few years and they're good, but recently swapped to Winmax W5 and they are even better.
Expensive but they last longer. Don't seem to have worn...
They all contain Si02 which is silica dioxide or just silica, also known as quartz.
Usually only a 0.XX% though in spray sealant form. So nothing like the coatings you apply from a bottle.
If the injector is bad then cleaning the spark plug won't fix it.
You could just replace one injector, but if they're all old you may as well do all four.
Flashing EML is a fuel injector.
Probably just a coincidence that's it's gone at the same time as doing the plugs.
The light will be solid now because it's triggered an emissions fault. Too much unburnt fuel in the cat. That's where the black soot is from.