Esha,
Yeah, I think the tolerances on the Rover engines were such that thicker oils aren't a big deal. IIRC 10w40 was specified in my original owner's manual.
There are a lot of old wives tales about synthetic oil, most of which come from the early 70s when the stuff was hitting the market in large numbers. There were instances of leaks etc due to the formulation, which has since changed.
Now, your tranny, tcase and diffs should all take 90wt. For the winter, you might want to try something synthetic as well. I currently have RedLine MT90 in the tranny and tcase...makes shifting a little easier at cooler temps.
Bogatyr
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Current Rover Fleet:
1996 D1 120k (finally on the road)
1970 IIa 88" (the running one)
1970 IIa 88" (parts truck - need any parts?)
1966 IIa 109" (next project...)
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