View Single Post
beepbeep beepbeep is offline
Registered User
beepbeep's Avatar
Join Date: Jun 2001
Location: Sweden
Posts: 5,565
Originally Posted by Craig 930 RS View Post
240 is NOT ok by any means, and the thicker oil theory, well...............ok.
Modern synthetic oil will work perfectly fine at 240 deg. F. Whether it's OK or not for engine itself depends on how much crud is accumulated on cooling fins, ambient air temperature, timing etc. There are limits on how hot heads can get and turbo heads will withstand a bit more heat than n/a ones (up to 993, when all heads were made of same heat-resistant alloy).

And yes, it's a well known fact that higher viscosity oil yields higher temperatures. also had opportunity to test this myself on the track this summer. Oil temp with 10W50 was 266 deg. F and after I changed it to 5W30 oil temp went down to roughly 240 deg. F. Same car, same oilcooler and same track. Ambient temperature was similar as well.
Thank you for your time,
Old 08-24-2008, 07:09 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #33 (permalink)