Hey thanks for helping,
I have an air cooled 1987 911 which has flat tappet's and needs zinc for protection but have been told that zinc will
hurt/kill the Cat over time so it seems like a catch 22. I believe that zinc has been replaced with other wear protection ingredients but am still
not sure what oil to use.
Valvoline VR1 apparently has 13% zinc which is great for the tappet protection but is it bad for the Cat, I wonder what the zinc levels were back in the 80's when these cars were made. I don't know what the original owner used but the car passed smog with flying colors here in CA so if the oil back then had higher zinc levels it apparently didn't harm the Cat.
Also, the Cat's are NLA as CA requires so much of the pricey metals in them that there wasn't enough demand for third party's to produce them and while there are universal Cat's that are approved, you need both ends from an original Cat as they are not an 'in line' Cat like most of the cars
Anyway, just wondering what your feedback would be and really appreciate any help!
I have an air cooled 1987 911 which has flat tappet's and needs zinc for protection but have been told that zinc will
hurt/kill the Cat over time so it seems like a catch 22. I believe that zinc has been replaced with other wear protection ingredients but am still
not sure what oil to use.
Valvoline VR1 apparently has 13% zinc which is great for the tappet protection but is it bad for the Cat, I wonder what the zinc levels were back in the 80's when these cars were made. I don't know what the original owner used but the car passed smog with flying colors here in CA so if the oil back then had higher zinc levels it apparently didn't harm the Cat.
Also, the Cat's are NLA as CA requires so much of the pricey metals in them that there wasn't enough demand for third party's to produce them and while there are universal Cat's that are approved, you need both ends from an original Cat as they are not an 'in line' Cat like most of the cars
Anyway, just wondering what your feedback would be and really appreciate any help!