Conv. motor oil temp breakdown

4 replies to this topic
  • XR Dude

Posted February 03, 2005 - 06:12 AM


Anybody know at what temperature conventional motor oil starts to have trouble and breakdown. On Mobil 1 synthetic it says on the bottle 400 degrees. I run Castrol 20-50 and wonder how it does at 300 degrees on my temp dipstick in extreme conditions. Thanks in advance.

  • roadcam

Posted February 03, 2005 - 08:05 AM


an Amsoil brochure I read claimed petroleum oil starts breaking down at 300 degrees ...

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  • babbs

Posted February 03, 2005 - 08:06 AM


If your XR is running at 300 degrees something is not right. I would try adjusting your jetting. If it is an XRL, 250 degrees is about as hot as it should get, an XRR should be even less.

Just my experience.


  • frankstr

Posted February 05, 2005 - 05:46 AM


If your oil temp is 300 dgrees ,something IS wrong.. :cry: :cry:
Thats to hot,The oil is basicly trashed at that temp.

  • kelstr

Posted February 05, 2005 - 06:07 AM


250 and the dino oil is junk and your motor is not far behind------that is why the syn stuff is the way to go,----on a good set up race motor we will see 300 degrease in the oil, -------1250 to 1400 2 " after the exhaust port.----and you dont want to know how hot the clutch gets -------you have to run syn these days--------but if your bike is stock it should not get that hot.

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