Got a oil temperature guage on the L&K and wondering what temperaure is optimum, when one should back off etc.

Quick Google seems to suggest 100C is OK and maybe 115 to 120 C is getting a bit high and 150 C is critical.

Anbody got more detail on this?

On SWMBOs TSI VRS you just do not worry about as you do not see it but presuambly there is a warning light and an engine cut out at set temperatures?

0-30 W oil looks like water to start with so what it is like at 120C.

Snow presumably can make temp rise ie bloackage, driving slow with lots of load, drivers forget this often as it is so cold but engine not working normally and over heats I guess.

Edited 4 December, 201015 yr by lol

I've had trouble getting my diesel up to 90 in this weather. It was -9 yesterday, and I'd driven almost 30 miles to work before the needle pointed up to 90.

I did make sure the front grille was unblocked before I left.

Mine stays on 98-105 on normal driving. Had it up to 116 on twisty uphills fully loaded and seen in summer on 40C at 121 in motorway.

From the Mobil website

^{Mobil 1 Cold Temperature Properties}

^{Mobil 1 has outstanding low temperature fluidity (it will flow at temperatures below -54°C) and allows the cold starting potential of any car to be maximized. Most engine wear occurs during the critical first seconds after start before the lubricant flows into place to prevent direct metal-on-metal contact. At all cold start temperatures synthetic oils get to the critical wear areas (camshaft & bearings) of the engine quicker than equivalent mineral grades.}

^{Mobil 1 Hot Temperature Properties}

^{So what value is this at high temperatures? At high temperatures the oil molecule in synthetic oils are far more stable and degenerate less. This means not only do synthetic oils maintain lubrication integrity, they continue to cool and clean engine components at constant temperatures of up to 180°C, and can handle short term temperatures in excess of 200°C.}