+1 same experience in different cars.
Mitch Haley via Mercedes <mailto:mercedes@okiebenz.com>
January 16, 2020 at 8:30 PM
One thing I always liked about M1 that seems to still hold true is its
volatility, or lack thereof.
In 1989, I bought a new Plymouth Horizon, and mostly ran 5W30 M1 in it
every 7500 miles. Around 1993-94, Castrol ran a rebate on their
Syntec (5W40 or 5W50, I can't remember which) and I tried it. They
only had one viscosity grade, presented it as one size fits all but it
was too thick to run in the Horizon, I just didn't know better back
then. Within 5000 miles the oil level had dropped quite a bit. I never
added oil in 7500 miles with M1. My 1977 Saab was even better, I'd
drive it 7000 miles on M1 and the dipstick would still read at the
full line, and the oil would be fairly clear. In the late 1990s,
Meijer started selling store brand 'full synthetic'. I put it in the
Horizon, and was a qt low at 3000 miles.
More recently, the 220kmi Saturn goes 11,400 on the oil life monitor
without a lot of oil consumption, been running 5W30 M1 in that since
186k, and I believe the PO used it most of the time too.
While I realize there isn't much relationship between lubrication
quality and lubricant evaporation, it seriously annoys me to have oil
just up and disappear under conditions that M1 stays in the sump.
Mitch
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