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About to switch from dino oil to synthetic, any reason why I shouldn't?
I've been running Castrol GTX 20/50 for a while, on a rebuilt 83 SC motor that has about 90K miles on it. I just ran through a tank of gas w/ Chem tool B-12 in it and am now about to change the oil. I want to go with Royal Purple 20/50. I am absolutely_not_trying to start another oil thread, I just want to hear, if there are any, legitimate reasons why I should not switch to a synthetic. Also, has anyone heard of doing a "double oil change" after running a can of Chem tool or Techron through their system? As in, drive through a tank of gas w/ Chem tool, change your oil with something cheap--run that only for a little while, like 20-30 miles--then change that oil with the oil you use in a regular oil change? Apparently it works to get rid of any carbon deposits that might be loose in your engine after using a Techron-type product. Total BS?
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