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Can anyone answer this for me. I just hade number 7 injector replace on my 2007 F350 and I had my oil and filter changed a week before it was replaced with Shell synthetic and I just check my oil and it's very dark!! do you think I should change it.
Yes it a CJ4 grade from Shell, they say it the best !! however when I use Ames or Mobil 1 after 10,000km it is still clear. So should I change it just after having number 7 injector replaced and my fuel pump.
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