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I don't think these cars really need mobil 1 under normal driving
conditions. Mobil 1 is great stuff but I think most of the time you
want to use it in super high heat situations like if you have a turbo
or because you want to use the same oil in the motor for 6 months /
10,000 miles between changing the oil. B20s under normal driving
conditions should never get into temperature ranges where a normal,
high quality oil would break down. Also, even with D-Jet fuel
injection, a B20 will get enough gasoline into the oil that you
wouldn't want to leave it in the crankcase for 6 months and you would
never ever dare do such a thing with carbs because you'd be driving
on 10% gasoline / gasoline residue in 6 months.
I used mobile 1 15/50 in a 164 because I live where it gets to be
130 degrees or more at street level and the temperature gauge would
sit in the middle of the range most of the time, higher at times and
dive into the red when the motor was shut off. I replaced the
radiator and put in a 160 degree tstat and that solved that problem.
In a B20/B18 motor I would stick with a good diesel motor oil like
chevron Delo 600 15/40 and change it every couple months / 3-5k miles.
That is, unless you have a turbo or supercharger or unless you spend
long periods of time (2-10 minutes) at continuous full throttle, ie
unless you tow things up long hills or race.
Oh, and your motor will last far longer if you use good oil filters
like the mobil-1 filters or the Mann filters volvo uses OEM.
chris
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