I have a 1995 Jaguar XJ 3.2. It has always (as long as I've had it) been given 10W-40 semi-synthetic. Today I bought fully synthetic accidentally to top it up (no problems, just cold starts recently using a little bit more), not realising until almost half the bottle had gone in. The car will probably be serviced at the beginning of next year anyway, as the oil was last changed just over 6 months ago, but I just want to check that this will not cause any major problems until then.
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I would have no concerns about this
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