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Message: [QUOTE="TARM, post: 412942, member: 578"] Try swapping back to the 195 and I bet there is no dif in peak temps as again wide open is wide open. My bet is a lot of these engines have oil coolers that are at least partially clogged and then add to that more power from the engines and us pushing loads faster with that power temps are going to go up during those times especially when you add in hot weather. I just know from the testing I have read that I would rather have oil a bit warmer than colder. Oil does not even reach the rated SAE vis until 212 F degrees (100 C). If you look at the temps testing requirements of a number of the international oil ratings such as those put out by ILSAC which works along side API and its ratings mirror those in these standards its clear todays oils can take much hotter temps. Take the ILSAC GF-4 and API SM rating test as an example. ( now GF-5 and SM) One test bed takes running a 3.8 turbo engine keeping oil temp @ constant 300 degrees for 100 hrs straight. That would put peak oil temps at the top piston ring likley over 600 degrees. Most of the top CJ4 oils also meet or exceed the API SN/SM rating as well. In general diesel rated oils are seen as superior. Look at what the top oils go thru to meet certs and you start to realize the temps we see are not that bad. IMO we need to be much more concerned with shearing and its it effect on the viscosity modifiers which can then lead to higher aeration conditions etc.. [/QUOTE]

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