Hi guys

Just joined and I'm getting straight in with questions, hope you knowledgeable bunch can help?

I have a 1997 S70r manual, as the title says I've Mayo in my expansion tank

It happened this morning, thankfully on my way home and almost in my drive!

Water over pressurised, steam clouds and mayo oozing from an expansion cap....grrr

Engines done 117k and has a great well maintained history, engine runs very well, no misfiring, no steam from the exhaust, no signs of any mayo on the oil filler cap or the dipstick.

So there's obviously an issue here!

Is there a possibility that it may be the rad/oil cooler or the dreaded HG?

Any advice would be greatly appreciated 😀