OK, I found the quote in David Hardcastle's The Rover V8 Engine...
"The Rover V8 does not like modern lightweight oils, in fact 5W-50
oil could, under certain circumstances be detrimental to the engine.
Thin oil cannot be pumped in volume in the same way as heavier oils,
although the pressure will be maintained. For competition purposes
try to use straight SAE 30 or 40 oil although THE oil for the Rover
V8 under serious competition stress is Motul V300..."
found in Chapter Nine, Getting Technical. Also note that this book
is copyrighted in 1990 so this is OLD information. No, I'm not
intending to use my car in competition but I AM concerned that I'm
getting it the best possible lubrication available.
Jim
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