Join Date: Aug 2018
Location: Lowell area, MA
Mentioned: 3 Post(s)
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If your fuel has ethanol (I don't know if that's typical in the UK), then using fuel stabilizer is a very good idea. Personally, I would close the fuel shutoff, and run the engine until it dies (as has been described), when shutting it down.
Hopefully someone will weigh-in on the 10W40, vs 10W30. I would prefer to stay with 10W30, if possible. My concern would be that the first number (10) is the cold-weather behavior. So that's good; for winter, you don't want straight 30 weight. But as the engine and oil heat up, I'd expect it will now behave like 40 weight oil, not 30. That might be a little too-thin for the engine.
KRE, I'll confess that's the first time I recall hearing advice about rotating engines periodically, and by specific amounts, to help with valve springs. I'm not saying you're wrong, but I'll offer that I've never done that, and am not aware of having any valve-spring issues. In the interest of simplicity, I personally would feel OK with skipping this part of the process.