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cold engine knock after switching to Mobil 1 synthetic 1

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Old February 14th, 2012, 12:34 PM
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Question cold engine knock after switching to Mobil 1 synthetic 1
I started doing my own oil changes in the last year.I switched from conventional oil to Mobil 1 synthetic using a standard Fram filter.From time to
time I get a knocking sound on cold engine start ups.Any one have a idea why
this is happening.Thanks.
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Old February 16th, 2012, 9:41 AM
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Used to happen to my 02 Tahoe also. There was a bulletin from GM saying it did no harm to the engine. Oh really?
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