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Message: [QUOTE="TARM, post: 414755, member: 578"] I very much doubt you will see any change with a different oil. Tech thicker oil would cool slower and retain more heat not less but there are a ton of things at play I am sure with that given additives and what not. The issue IMO is your oil cooler as I suggested at the start. It is a common issue to have them either leaking or clogged to some degree. Not a hard fix either just some time to get it off. Again you temps are nothing crazy or something to loose sleep over imo but I am very picky as well and want things as good as they can be so I understand the attention you are paying to it. Maybe I missed it but I do not see where you posted coolant temps vs oil temps as that will be a clear indicator of a oil cooler issue. But 190-200 unloaded cruising is very normal as that is where your coolant would even warm the oil to and for a good reason as I explained. From the 200 F point it more becomes a issue of keeping the engine cool. The Tstat will open as much as needed to try and keep it at 195 and will be wide open by 220. The fact its wide open @ 220 is why if you are seeing temps above this as you report why a cooler Tstat can not have any effect on the constant average cruising temp. It would have been wide open sooner but the fact the temps are getting 10 degrees over that means it will not offer help. It will also keep the oil temps too cold in cooler weather and take longer to warm up. IMO if the temp between coolant and oil @ a steady cruising state is more than 15 degrees apart its a possible indicator of oil cooler inefficiency. IF they are both inline but over all temps are too high its a indicator of either a coolant system issue and or exceeding the abilties of the system with too much load. Such as could happen when you increase the engines power then use it under heavy load for sustained periods. If anyone would see this while cruising it would be Charles. If his temps stay inline then it would really have to point to a cooling system issue if oil and coolant temps are in proper ratio. Of course this all just my opinion based on what I know so take it for whats it worth. [/QUOTE]