Oil Cooler Thermostat S5
 

Just looking into future maintenance and "Spring".... Car is garaged non-the less

Just wondering on a stock S5 oil cooler from the 1990's would the thermostat open *LESS* with age? Oil cooler has been though several engines and most-likely would have sustained some heat.

I would imagine to reduce my oil temperatures at higher RPM and higher running temperatures I would be best to replace my thermostat?

"High speed --- temperature issues is one I am having at highway speeds and with hot days". My FMIC is an issue , but the question could be applied to both aspects or nay?

The thermostat is easily removed and tested, so you needn't wonder, just find out.

Mazdatrix sells new thermostats too, just in case you need one.

be careful when you take it out and reinstall it... you can crack the aluminum bungs on the cooler pretty easily.

They are a mofo to get the line off too

I guess...
 

I might be better off replacing the oil cooler I think, the replacement via matrix costs roughly $200 CAD shipped

Do you see why I asked for symptoms and a question, it's not even funny anymore.
I'm going to assume it's exactly like a coolant thermostat and doesn't open all the way when it's going out.

Pressure wise I can't say it's conclusive as pressure is optimal in stockrange - but it's a thermostat so maybe flow isn't optimal at higher levels to be noticeable on a AM gauge at the filter.

They very rarely fail, figuring they are oiled pretty much 24/7

As was mentioned earlier, the banjo bolts can be a bitch to get off, and you can easily crack the aluminum bungs. You better off using an impact wrench rather than trying to wrench them off by hand. You're less likely to crack the bungs when you use an impact wrench.

I hadn't come across that situation.
 

I'm running Racing beat oil cooler lines and adapter fittings, though this could be an issue with majority of owners with long-term sitting periods.

The plan is to rebuild my oil cooler to eliminate oil cooling issues from a FMIC, at the same time fix it for hot laps.

I just don't know if rotating the oil cooler 90 Degrees will suit the thermostat either.

http://i68.tinypic.com/mi2ydh.png

Image shows the outcome of the oil cooler versus facing the front of the car it will oil up- toward the hood with a "Pan Speed", style cut-out. It's sandwiched in-between the Inter-cooler and Radiator. It all should work fine with the stock oil thermostat regardless of position.

If I can't get a thermostat locally for less then $90CAD I'll just buy used FD twins and make lines for $100

The oil cooler or thermostat isn't going to care if its up, down, sideways or cockeyed. The hot oil is what opens the thermostat, and oil pump does the work from there, cooler is just there to cool, long as it has fresh air hitting it, engine will be happy