Hi, I wonder if Lucas Additive are very good for Mercedes-Benz since their reputation not only for racing but for keeping car longer ( Long Life ) ?and the KN Air filter or Cold air Intake is it good or can damage the engine because of the oil inside the filter, I don‘t want to race with a Mercedes but sometimes I like the Sound of Aggressivity ] ( Vr00m Vr00m )
Oil additives don't help very much. A premuium brand of oil has all of the additives you need. Change the oil often, and replace the air filter every 20,000 miles. Anything more is a waste of money. A 190E will never sound like a V8, Keep the original design for the intake and exhaust, and just drive the pi*ss out of it.
The additives were always more marketing than engineering. Like racing drivers use it or keeps the F1 engines running longer. Perhaps, but there's not enough evidence that support it. I'd also leave the intake as it is - the problem with the washable filters is not the oil in them but the so called filtration class. And lower filtration class will just let the dust particles into the engine with all consequences.
Lucas may help but the best thing you can do is change the oil every 3000 miles. K N or cold air intake is a waste of money.