Quote:
Originally Posted by soundman98
this came up in another similar thread a while back. subaru uses a thin sheet metal oil pan that easily deforms. the block is also multiple separate parts that bolt together across the oil pan seal.
so to use a gasket would require a thicker oil pan. not difficult. but also, the block mating surfaces would need to be lapped after the block is assembled to ensure a perfectly flat surface for the gasket to seal against. which is really where a sealant works better than a gasket.
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Additionally, even if you spend a good bit of $, to install an oil pan with a thick precision machined flange to remove that RTV from
that part of the equation, what do you do about the other 90% of the RTV that is used in the engine?
Only addressing the oil pan is mostly an exercise in futility.
Just went out to the shop and snapped these pics of the block-to-upper oil pan RTV. These are only the areas that can be seen, but there is a lot more that can't.
Anyone can also go pop the hood and look on the timing cover and other places to see RTV oozing out everywhere.