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Old 12-01-2012, 10:56 PM   #6
Scooby Specialist
Member#: 329526
Join Date: Aug 2012
Chapter/Region: SWIC
Location: Ground Control
2013 Impreza Spt cvt


Amsoil and M1 are Group IV oils, fully synthetic. Group III are allowed to be called "synthetic" but are not as good as Group IV. There is a lot of info on the internet, is a good source.

I have been using Amsoil in my vehicles for years, and will start doing so in my Impreza when I feel the break-in is optimal - probably 10 to 20,000 miles. I've been using it my Corolla for over 150,000 miles, changing it every 20 to 25,000 miles, and still get well over the EPA mpg estimates - in fact it's rated at 36 mpg highway and I get that at over 75 mph. It does use a quart of oil every 15,000 miles though, which works out okay since I change the filter about then anyway. I've done oil analyses a couple of times at 25,000 miles and it was still good.

I even put M1 in my 1978 Landcruiser and it ran noticeably smoother...
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