acflye Posted September 21, 2007 Share Posted September 21, 2007 I have a 92 LS 400 with 180000.....regular changes.....want to switch to full synthetic (mobil 1) is that to many miles to switch and do I need to seafoam the engine.....how is the seafoam thing done...pour it in and let run at idle for 30 min or what? Quote Link to comment Share on other sites More sharing options...
mburnickas Posted November 20, 2007 Share Posted November 20, 2007 I have a 92 LS 400 with 180000.....regular changes.....want to switch to full synthetic (mobil 1) is that to many miles to switch and do I need to seafoam the engine.....how is the seafoam thing done...pour it in and let run at idle for 30 min or what? No, you can switch anythime. I have switch cars only up to 160,000 miles to date. I would rather use, Lc20, B12 or Amsoil engine cleaner; since they are the best bang for the $$$$. Quote Link to comment Share on other sites More sharing options...
ErMaK Posted November 25, 2007 Share Posted November 25, 2007 There shouldnt be a problem with switching over to synthetic however personally I tend to always try and at least use the same "brand" of oil that I have been using. Quote Link to comment Share on other sites More sharing options...
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