Holden Apollo= Toyota Camry.
Yes i have found aftermarket components fail, factory ones are far superior.
Some basic points first.
When a plug end breaks, its a good sign that the car has not been regularly serviced.
If it was the plugs would have been regularly removed and replaced leading to the leads being regularly removed and not binding on and then cracking/breaking when removed.
Tip; with removing any lead ends, twist them while pulling from the rubber boot, it helps break the bond to the spark plugs.
The problem with components is a little complex when it comes to Aussie built Toyota's.
All parts via Toyota are far superior in quality to the general over the counter car parts stores, but on the other hand far more expensive.
The problem i have found is that Toyota Australia sources many components from Australian manufacturers and the quality of parts not as good as the imported Toyota's.
I have found parts such as leads and thermostat's far better from Toyota, my current Camry company car had its thermostat replaced at 200,000Km with a non genuine one, 15,000Km later its stuck open and the car runs far too cool on the open roads.
The ultimate in reliable components are on the fully imported Toyota's, the quality is amazingly good and reliable but shockingly expensive.
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