I decided to ask Mobil a question on my use of Mobil 1 here is the question. I switched from 10W30 Dino to 10W30 Mobil 1 in my 1987 Volvo Turbo. I am concerned over the increased oil temp. If sitting in traffic the oil temp will jump up to as much as 290 degrees. Once airflow is reestablished through the oil cooler the temp drops back to 190 degrees. With dino oil it would rise at the most to 200 to 210 degrees with a normal running temp of 180 degrees. I'm very concerned to why the Mobil 1 is holding heat in and not dissipating it as quickly as dino oil does. Subject: Mobil1 product Technical question Date: Thu, 28 Aug 2003 22:53:07 -0500(CDT) From: [email protected] To: [email protected] Dear Sir, Thank you for your inquiry into Mobil -1 10W-30. We are not aware of any problems with Mobil -1 holding heat as you described. I suggest that you pay close attention to your owners manual. Regards, REC - Technical Support The above information is provided in good faith based upon the information presented by the customer. ExxonMobil is not responsible for any loss or damage resulting from inaccuracies or errors in any of the information provided or any acts or omissions taken in response to our advice. Exxon Technical Support: Mobil Technical Support: 1-800-44Exxon Prompt #3 1-800-Mobil25 Prompt #3 1-800-443-9966) (1-800-662-4525) Pay close attention to your owners manual? What the Phuck is my owners manual going to tell me about why my oil temp is running 10 degrees hotter under normal use. And jumping 100 plus degrees if I'm stuck in traffic when using M1 over dino.