But what brand do you use,?, i used Halso 10w30 , tailor made for vw air cooled engines up untill a few years ago, but no longer available , i now use Westway Lubricants 10w40 , has all the necessary additives, if they did a 10w30 i'd use it.
I had a similar experience with them, i was ten months into a policy and still couldn't organise the agreed value, pulled out there and then, now with Hagerty.