I used HT I think. My almost completely full tube burst open too (I just noticed a few days ago!). You just use a little around the corners of the valve cover to keep it from leaking.
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Andy - Reinstated
Hybrid Forum Moderator
'06 Subaru Legacy Spec B - Stock, for now
'98 Civic EX - CTR headlights and grill, Kosei K1's, for sale
'90 240SX - SR20DET that will never get installed, project car.