I recall when these synthetics made an appearance in the [60's] ?
Seems I recall that it was recommended to only use them in NEW cars for some reason.
Seems there's a new revival of these that they "push" at the auto stores.
I've always used Castrol 10/50, but I'm wondering if there is any advantage or virtues to the synthetics.
What do you think fellow Jag lovers?
Roger