02zx9r rev2
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The OLM was at 50% when I changed it, don’t think I would have wanted to know what the tbn and visc would have been had I ran it down to 5-10%I personally would not be happy with the drop in viscosity, even though the engine didn't seem to mind.
I refilled with 5W30 Castrol EP and will stick with 5 or 0W30 here on out