Maximum safe oil temp

[J4P RX]

Im just curious as to what people think this might be.

Cheers
Lee

[Fish]

Depends on the oil used.

From memory mineral oil will break down before synthetics, but unless its Royal Purple it might cause problems in a rotary.

Fish

[J4P RX]

Yeah Im aware of that, but what sort of figures are we likely to be talking.

I need to weigh up my options on how much im going to need to do to make the car ok for track, and oil temp would be a concern.

Lee

[gsb876]

I\'d like to know this just outta curiosity???

[g11ary]

Its very hard to give accurate details as it depends on so many things, how old the old is, make and quality, how long sustained at a given temp. It may be fine at 105 degrees but for only a short time. Maybe fine at 100 degrees but not for a track day.

But approx, ball park, average mineral oil will start to break down at 105-110 degrees, it loses its visoscity and starts become watery to the touch. Fully synthetic will be fine at temps above 120-130 degrees quiet comfortably.

All healey racing cars are now using royal purple because of there protective properties and these are old classics, after 2 years the oils was drained and was still clean and in good condition when tested. There is also a guy how has raced his M3 for 2 seasons on royal purple and again clean and still in good quality.

http://www.hannibalrx7.co.uk/acatalog/Royal_Purple_Oils.html