It's silly to talk about 'Rotella' without specifying which particular product you're talking about. Most stores carry three different Rotella oils: conventional T4, semi-synthetic T5 and full-synthetic T6. They're quite different and meet different specifications. And there are other products marketed under the Rotella brand, although most are not readily available.
One of the more interesting oil specs is JASO MA, which means the oil is approved for use in motorcycles with wet clutches. (Which is to say virtually every non-BMW bike on the road.) Shell says Rotella T4 and T6 meet JASO MA and MA2, but they don't make the same claim for Rotella T5. Go figure. At any rate, Rotella T6 is a pretty cost-effective substitute for synthetic motorcycle oils like Mobil 1 Racing 4T, which runs about ten bucks a quart.
A friend of mine who was a powertrain engineer for a major OEM told me they were having piston ring problems with conventional oils a few years back. Those problems disappeared when they tested with Mobil 1. Which explains why more and more OEMs are specifying full or semi synthetic engine oils. Not all oils are the same.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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