In regards to the discussions on using Volvo Blue Engine Coolant, does anyone have an idea on how long the engine block can stand another coolant before coolant seepage starts? I have found a very nice S90 with 84K miles and the owner is asking $8500. My only concern is that the engine coolant is not blue -- instead it appears to be Prestone or some other brand that is a Greenish to yellowish color. Should I stay clear of this seemingly flawless vehicle?
Also, what is the rationale for using synthetic oil in these vehicles? Are the seals compatible? How often should the synthetic oil be changed? Castrol not good enough?
Thanks in advance!
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