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Just rebuilt my b21fti about 2500 miles ago. Since then I've noticed that at idle my oil pressure reads low, sometimes even the light comes on. I tested the pressure and it read 11-13# at idle and 45# when revved up. Mechanic said nothing to worry about as long as i have proper pressure when driving. He also said to run normal oil, not synthetic. I'm not so sure about this so I was wanting some advice. Currently I'm running Mobil1 10-30 synthetic and was thinking maybe it is too thin. Not sure. Should I try 10-40 synth or otherwise? Or should I go back to regular oil to see if this helps. Again, its's only at idle when the pressure is low and I think I hear valves too.
Thanks.
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