Hello gents;
I have a 95 Jaguar XJS with a AJ16 straight 6 4.0 engine that I have been running M1 HM 10W40 in for 8 or 9 years. At the time I picked this oil, the ZDDP was 1100. A few years ago I found it went to 1000, and I just now found out it’s 900. The AJ16 is a flat tappet engine, so when I originally chose to stick with this oil, that was a factor. The car was my grandfathers new, and when I got it, I made the switch to the M1 HM and replaced the seals that leaked at that time. The engine has 118k miles and the car is driven on weekends only.
I think I want to switch over to Amsoil Z Rod 10W40 because of the higher ZDDP and because since they are a smaller company it seems that they won’t be constantly reformulating the oil into something unrecognizable from its original formulation, so I won’t have to worry about changing brands again.
My concern is with how the seals will react going from one oil to another. I have been pleased with no oil leaks with the Mobil HM this far, and when I called Amsoil Customer service today and asked about seal conditioners in their oil, they told me they don’t advertise any oil conditioners in their oils. So this point has me concerned.
Any help greatly appreciated
I have a 95 Jaguar XJS with a AJ16 straight 6 4.0 engine that I have been running M1 HM 10W40 in for 8 or 9 years. At the time I picked this oil, the ZDDP was 1100. A few years ago I found it went to 1000, and I just now found out it’s 900. The AJ16 is a flat tappet engine, so when I originally chose to stick with this oil, that was a factor. The car was my grandfathers new, and when I got it, I made the switch to the M1 HM and replaced the seals that leaked at that time. The engine has 118k miles and the car is driven on weekends only.
I think I want to switch over to Amsoil Z Rod 10W40 because of the higher ZDDP and because since they are a smaller company it seems that they won’t be constantly reformulating the oil into something unrecognizable from its original formulation, so I won’t have to worry about changing brands again.
My concern is with how the seals will react going from one oil to another. I have been pleased with no oil leaks with the Mobil HM this far, and when I called Amsoil Customer service today and asked about seal conditioners in their oil, they told me they don’t advertise any oil conditioners in their oils. So this point has me concerned.
Any help greatly appreciated