Thanks for the info....
This weekend had a massive oil change party..... Changed oil in all 4 cars and added the fuel additive:
2003 Honda S2000 : no change can't do much to inprove
1997 Lexus LX450 : better oil pressure
1994 Dodge: sounds quite
1988 MZB 300CE: better oil pressure sounds quiet
Time will tell!!!!!!!!!!