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As far as the temp, you may just need a new voltage stabilier for the gauge if it's wandering around.
if in a hot climate, 15w-40 is fine ( although I'm not fond of rotella after loosing an engine because of it, if going dino oil,go with the delo, it holds up better ) if up north, you would want something a bit lighter and would have to go synthetic, there are no 10-30 etc oils that are diesel rated unless synthetic ( look for the CD, CF etc marks on the jug the C indicates diesel, the S ratings are for gas burners. diesel oil is designed to handle the extra soot)
If yours has a fan clutch ( it most likely has a fixed fan ) it is probably due for replacement.
If timing is too far advanced, it can cause overheating, do you get an excessive amount of diesel clatter?
Check the coolant in the expansion tank mounted on the fender. to flush the system, you can make a hose adapter to fit a garden hose and attach it to the drain fitting to the rear of the lower hose on the engine. the fiting opens by turning with 13mm wrench, remove the expansion tank cap and you can bachflush from there.Replace the cap with a new black, low pressure cap.
Do you have any idea when the timing belts were last changed on that thing?
if not CHANGE THEM NOW! this is an interferance engine. if the belt blows, the valves go through the pistons.
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '92 Ford F350 diesel dually
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