Oh for petes sake, not another coolant gauge question?!
Hi! I have had my R56 cooper S (2013) for some time now and had a few issues recently. First the aux water pump went, then the water pump, and then I lost almost all of my coolant when the oil filter housing went. I've also noticed some build up of emulsification under the oil cap (probably caused by my commute recently changing from 40 miles each way to 9 miles each way... hopefully... but we'll get to that).
So, I've decided its probably time for some kind of a coolant/temperature gauge. After searching forums and online stores and very nearly getting the 'mini' aux gauges I decided that the most cost effective approach was a Scangauge E. No drilling, no holes, minimal effort and very low cost (relative to some options).
Happily driving around but have a query. Previous cars, the temp needle gets to about 90 degrees C and then just sits there, static. What I've noticed with the mini, is that it seems to fluctuate quite alot. One minute we're at 95 and the next minute its jumped down to 75 or 80 (ish). This could be normal operating as the thermostat opens and closes but my expectation was that the temperature should be fairly consistent once its warmed up. Could someone advise whether this sounds like normal behavior or could it indicate a faulty thermostat or sensor? and if so... does this suggest that the reason my oil is going a bit gammy under the cap is because the temperature isn't getting hot enough due to a sticky thermostat?
Dealer has indicated that 9 to 10 miles each way to work isn't sufficient to get things hot to burn off moisture but I've never had this problem with other cars so wondering if there could be some kind of a problem at play??
Advice much appreciated.