On the way to S Wales, 27deg today car was up to 104 after 30 mins, then went to 106 and only when the speed went to 30-40mph the temp was back to 99ish.
This normal?
Probably, due to the warm weather. It's a small blip and then settles back to sub 100. Unlikely to be a big deal.
Having said that, I've just replaced my oil cooler. Car was starting to sit at 105 to 109 on a normal 55mph road and then up to 119 on 80mph drives. Took ages to come back down again. I knew that wasn't right. A few YouTube videos and Google-Fu later and I decided that the oil cooler was probably at fault.
This is for 2 reasons:
1. The actual oil filter housing that bolts to the block is made of VAG plastic/chocolate/brittle bar and is prone to leaking. It's usually the rubber seals that fail and cause an oil leak.
2. The actual oil cooler "radiator" gets bunged up over time, much like the good old heater matrix. Coolant doesn't flow very well and the oil gets too hot.
Although I can replace just the cooler, I decided that due to the amount of work to get to it, I may as well replace the oil filter housing as well. The book says it is a 4 hour job and it took the garage 6.5 hours, just due to the amount of pipework that needed removing. We had a play with the oil cooler and it definitely had resistance and reduced coolant flow when run under a tap. They eventually blew an air line through it and although coolant flowed, It was under a much higher pressure than the coolant usually flows at.
I've only driven the car locally since it was done (£750) but so far so good. Need a longer run to be sure. Just a heads up for anyone else who might have unreasonable high temp issues.