Funny, about using only linseed oil, I asked the same question a while ago in an art shop and they told me it could clot after a long time. Just today I asked in a forum and somebody said "this art shop should not be in business". And its ok as long as you don't use too much of it. I am painting atm only with oil, no turpentine and use oil if the layer got too dry - so no short time effects for sure.
Maybe you can get walnut oil where you live, I heard the quality is even better compared to linseed oil.
But I don't know what you mean with "rub down the painting"