I torqued it in a crisscross pattern in stages by feel. I did it that the way on my wagon and it hasn't leaked a drop. I know a lot of folks on here are big on using a torque wrench on every bolts, but I used to work on my older cars for years and only used a torque wrench on critical engine bolts, etc. (i.e. head bolts, wheel bolts, etc.) Never had a failure. I don't think every little bolt on the car requires a torque wrench. The valve cover just has to be evenly tightened and it shouldn't leak. Just my opinion.
I agree, My statement was more reflecting the metal nerd tool that is a 1/4" drive versus the kit you posted a link to.
The nice thing about the metal nerd tool is you can use a screwdriver style driver and maintain the 7lbs torque requested on those bolts.
The other thing is if you bow the cover it never gets straight again.
Moving down the back of the block the most likely thing is the turbo supply and return lines, then turbo seals.
The unlikely thing is the bolt hole for the engine block being broken through to the oil galley, and the vacuum pump seal is more likely.
The front seals leaking would run down though the timing belt area and could blue back up and around as the rear seal could.
The oil plug would be more likely to cause an issue though.
One more thing to look at is the oil cooler. Without the engine cover on it can leak down and blow around also.
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