Gona be performing an upper cylinder injector cleaning to my friends stock low mileage 03 LB7. I believe I read somewhere that 2 stroke oil can be beneficial to the fuel pressure regulator. He's had an intermittent engine light with a P0089 code and I thought if i run some 2 stroke oil through the system that it may solve his code issue. Well after I perform the cleaning cycle I was thinking about idling through another gallon of #2 with the 2 stroke oil but I'm not certain as to how much oil to add to it. I have a 16 ounce bottle of Maxima Castor 927. Its a synthetic blend made of synthetic esters and degummed castor oil. Does my plan sound okay in terms of preventative maintenance. Whats your thoughts guys. Thanks.