1989 Y60 4.2 diesel

[Noozild]

The old girl still runs well but recently we noticed oil in the top of the coolant. Took her to the mechanic who checked the oil-cooler and replaced the gasket. $700 later we took her home and all was well for a few months, but now we're finding oil on top of the coolant again!

There is no overheating and the oil is not emulsified; any clever person seen this before? Would value some opinions.

Thanks. :)

[the ferret]

Hi Mate and welcome, there is a chance that the oil cooler may have a pin hole in it somewhere.
The only other thing I can think of would be a faulty head gasket.
Take the dipstick out and hold it over a candle and see if the oil spatters, that may indicate water in the oil.
Keep an eye on temps.
Cheers, the ferret.

[Noozild]

Thanks Ferret, will try that. Temps have been fine, but she's losing a bit of oil for the first time ever. She's done 340,000Ks, so doesn't owe us much, but it would be nice to keep her a bit longer - they don't make them like that any more. The oil in the coolant won't help hoses, either, I guess :(