What oil was being used before ?I wouldn't want to change the oil type frequently as it can lead to what is called a detergent affect. Stick to good one oil & one good oil source!I used the shell in my 2.OD with very poor results. I swicthed to Caltex Delo Gold and it smoked less. I personally prefer the Caltex Delo, use that in my 3L & 1KZ-TE engines.