N62 4.8 Oil Thermostat Gasket Leak (2007 X5)

[Entropy]

Originally Posted by SeanC

Mine was replace at 77,997 miles. Probably started leaking a couple of thousand miles earlier. Right on the money.

I think the fact that our engines run hotter than most V8's is a contributing factor to why these gaskets harden up over time. I swapped my thermostat with a lower temperature one in the hopes of preventing this. Not counting on it though.

Our engines don't run any hotter than other modern engines. In fact, I'd say with the oil coolers that most BMW engines have, they run cooler than other engines.

[SeanC]

Originally Posted by Entropy

Our engines don't run any hotter than other modern engines. In fact, I'd say with the oil coolers that most BMW engines have, they run cooler than other engines.

If by modern you mean newer turbo BMW engines, you're right. But you will find stock thermostat temperatures in the 160-210 range for the V8 LS engines from the same era as the E70, similar to Toyota V8s from the same era. Our stock thermostat is rated at 221 degrees, and I was constantly getting 230 with that thermostat (110 C). Oil temperature is probably higher. I wouldn't call that a cool running engine.

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