I'm going to change the spark plugs on my z20let, going for the ngk bkr6eix, first question is it better to use the 0.8mm gapped ones or the -11 1.1mm gapped ones,
I've read threads about this but only with controversial opinions from both sides and where can I buy them off the shelf?
Next is do the plugs have to be gapped when inserting or is the standard 25nm of torque from the trusty torque wrench adequate?
When changing the fuel filter, where is the fuel line depressurization clip on the z20let?
And for the oil, first, is it safe to use engine flush on the z20let?
What oil do people use on the most part? 5w 40, 10w40? Full synthetic? Part synthetic and also which brand?
Thanks for the advice in advance and please don't flame me if I've said anything stupid, Im obviously unsure or I wouldn't be asking lol