Brown spark plugs, what could cause this?

[grober]

are these latest pics the old no 3 plugs? whats the appearance of the exhaust pipe--brown+dry or oily black?

 

[aliharry]

are these latest pics the old no 3 plugs? whats the appearance of the exhaust pipe--brown+dry or oily black?

Exhaust insides are black dry like every petrol car I’ve had to be fair

 

[aliharry]

are these latest pics the old no 3 plugs? whats the appearance of the exhaust pipe--brown+dry or oily black?

So the plugs shown are the ones that needed replacing this is the general condition of all the plugs after 50k miles

 

[grober]

whats the engine mileage?

 

[Bellow]

If there's anything to worry about it will show up in increased oil consumption - though I doubt there is as the plugs at 2000 miles are spot on.