Welcome. I would also recommend going with a good 10w-40 semi synthetic.
5w-40 should be fine provided the engine is low mileage/been well maintained up until now.
Dropping the hot viscosity as well (e.g. 5w-30) is just bad news.
Congratulations to vtecmec for winning May/June's Lude Of The Month, with his DIY Turbo BB1 build.
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- wurlycorner
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