I have that exact same enigne in my 96 Contigue (Mercury Mystique) I have used both the Amsoil 10w30 (even though it calls for 5W)and now running the 0W30 past two years. (engine has 72,000 miles) I change once a year but only get 8000-10,000 miles on a sample, filter at 6 months also. My results on this same engine (no TBN, notration or oxidation though) are posted way back, several months ago under Mercury 4 cyl.
http://home.earthlink.net/~armtdm/merc.htm
I concur, Amsoil is full of crap in promoting 25,000 mile drains (well, 99 % of people go less then 15,000 miles a year so maybe there is little risk) but without analysis this is pushing it. I doubt there are many drivers/engines that can make 25,000 on Amsoil and still get good analysis. Of course, even with a terrible analysis who is to say an engine still cannot go 200,000 miles. No one has gone that route either to test it.
For me, Amsoil limits are 12,000 max and that can only be achieved on one car for me, all others are 7500.
[ August 24, 2002, 09:57 AM: Message edited by: Spector ]
http://home.earthlink.net/~armtdm/merc.htm
I concur, Amsoil is full of crap in promoting 25,000 mile drains (well, 99 % of people go less then 15,000 miles a year so maybe there is little risk) but without analysis this is pushing it. I doubt there are many drivers/engines that can make 25,000 on Amsoil and still get good analysis. Of course, even with a terrible analysis who is to say an engine still cannot go 200,000 miles. No one has gone that route either to test it.
For me, Amsoil limits are 12,000 max and that can only be achieved on one car for me, all others are 7500.
[ August 24, 2002, 09:57 AM: Message edited by: Spector ]