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Registered
Join Date: Mar 2005
Location: Saskatoon, Canada
Posts: 242
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Carl,
I've got M1 15W50 in my '77. It had a rebuild 35,000 mi ago and has the upgraded chain housing covers (that go with the hydraulic chain tensioners) and Carrera valve covers.
It doesn't leak. I've only had the car 3 months but have the records that indicate its had mostly synthetic oil but with the occaisonal non-synth change as well.
I'd go go for it.
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