Hmm...repeats on about a 5 second cycle...odd
Can you get electrical power to the car? If so it might be worth running a sump heater. I have a coffee pot warmer plate that I thought of using for that, but then I lost the parking, and motivation isn't high in Taiwan anyway, even in the "not summer"
I wonder what the 2 hours of manual labour involved?
I'd check my oil, (enough and reasonably fresh?), consider changing to a skinnier grade if you arent already as skinny as can be (though I hate to say that as it goes very much against my thick oil preference), and one with a lot of detergent in it.
IF going for further pro service, tell them to specifically check oil pressure against specs, IF they have this capability.
Paying them to randomly "have a look" seems likely to waste money.
I dunno what style of tappets this engine has, but someone will. I suppose its JUST possible they need manual adjustment, or more likely, that hydraulic tappets are a bit clogged.
In the latter case, you might, rather topically, benefit from a flushing oil
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