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now now .. I didnt say the engine would blow up smile I just said it prematurly wears the chain . and as for the duel filters .. they are mounted vertically , and never drain . therefore not needing to fill to build pressure . when you just screw a filter onto the existing mount .. the filter will drain , and need to be filled on start up ..
as I mentioned .. it's only mili seconds .. but as we know , most of the damage to an engine is done on initial start up , why help it ? stick with the small filter .

But on my last, hrm 4 or 5 oil changes i've done in both my 3.0 and 3.4, i've noticed the filter is still full of oil, and that the anti-drainback valve is working correctly.
I agree, that if you get a cheap filter, there is none, or there is a crappy anti-drainback valve, but in the premium filters, there is a valve (guess it's kinda like a check valve) that keeps oil in it at all times.
Plus... my engines dont have chains <img src="/forums/images/graemlins/drunk.gif" alt="" />.
Lol but still, if it's a good filter, even at the 30 degree angle or w/e toyota mounts it at, it wont drop all it's oil into the crankcase when it's shut off. Check for this next time you do an oil change.

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim