does LC20 cause leaks?

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3k into my switch to GC + LC20. now I'm seeing a slow leak - I think it's the rear main seal. have never leaked a drop of oil before.

just finished ARX cycle before putting GC in. before that ran Super Tech (group III) synthetic oil for a few OCIs - no leaks.

the GC is the first grp 4+ that this nissan VQ has seen. so not sure if its the GC or the LC20. in any case I'm not thrilled about it.
 
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