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I only have two owner's manuals for my four bricks... 1984 and 1985. The '86 and '83, both bought second hand, came without the book. I dug out the manual for the '84 today and it says to use 10w30, good up to 107 degrees. This seems a little thin to me. Then below that, it says in cases of "severe use", e.g. motorway driving, short trips, long idle times, etc. to use 15w-40.
Just out of curiosity... what brands and weights are other bricksters using in 200/700 series cars with success? Can an oil that is too heavy (e.g. 20-50) ruin the engine?
Many thanks in advance...
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