Dave Plowman (News) wrote:
In article .com,
wrote:
Tescos 99 stops my M3 from
making horrible low rpm pinking noises.

So would fixing the timing :-)

It would, but BMW say it's normal and won't do anything.

I thought the M Series engines were meant to run on Super?



The handbook says one will get more power and mpg from super but the
minimum RON is 95. Until recently all I could get around here was 97
and it still pinked. 99 from tescos works well but it still backfires
when cold. All "perfectly normal".