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I have the same car (though it is a 1993) and have only been using 15w40 Delvac since I bought it some 40k miles ago. Prior to me buying the car, it got a steady diet of Castrol GTX. I think 10w40 but maybe it was 20w50. I'd have to check, but either way, I don't think they were diesel rated back then, nor now. It was changed at 5k miles each time by an Indy and sometimes a dealer. Go figure.
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