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Mendel Leisk (not verified)    June 7, 2020 - 5:22PM

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I'm with you regarding the EGR being a likely suspect behind head gasket failure. But Im not sure about "back pressure" increase. You mean exhaust back pressure? Is the EGR flow rate (when new/clean) that much?

My take: the Toyota engineers are counting on as-new EGR air flow to keep combustion chamber temperatures down. When it's near-fully clogged, combustion chamber temp's climb, stressing everything more than design limits.

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