I have an 1998 Cadillac Deville 4.6L N* 45,412 (Original miles). I am the second owner, and it has been well looked after.
My question is this...
Being a flat tappet motor with 300HP do I need to add any Zinc to my oil since it was originally designed for the SH specification?
I've been told that the SN oil specification does not have the needed additives for the protection of the flat tappet designed engines such as the N*. Everything I've read states that the N* needs the higher Zinc content due to the flat tappet higher horsepower design. If I should be adding ZDDP what would you recommend I use and how much should would I use? Speaking with another N* owner of the same year as mine told me he uses Shell Rotella 10w30. (I know its not a race car nor do I treat it as such) The car has only had Valvoline 10w30 with the exception of the oil from the factory and with the exception of the factory filter has had only Wix oil filters. The car has only had 6 oil changes in its life. Just looking to keep it as pristine on the inside as it is on the outside. Your input and comments are appreciated and welcomed.
My question is this...
Being a flat tappet motor with 300HP do I need to add any Zinc to my oil since it was originally designed for the SH specification?
I've been told that the SN oil specification does not have the needed additives for the protection of the flat tappet designed engines such as the N*. Everything I've read states that the N* needs the higher Zinc content due to the flat tappet higher horsepower design. If I should be adding ZDDP what would you recommend I use and how much should would I use? Speaking with another N* owner of the same year as mine told me he uses Shell Rotella 10w30. (I know its not a race car nor do I treat it as such) The car has only had Valvoline 10w30 with the exception of the oil from the factory and with the exception of the factory filter has had only Wix oil filters. The car has only had 6 oil changes in its life. Just looking to keep it as pristine on the inside as it is on the outside. Your input and comments are appreciated and welcomed.