I mentioned the emission stickler because if it was there it would tell you exactly the timing for your particular vehicle. I don't know if there is a difference between US or Euro models (turbo verses non-turbo) or manual transmission models.

Also these threads are read by others and the info might help someone else.

On my different year and model the spec on the sticker is 15 degrees plus or minus one degree ATDC. That gives me a range of 14-16 degrees ATDC that is considered OK.

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84 300D, 82 Volvo 244Gl Diesel