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I’m puzzled. Why does the oil temp have to be over 200? Isn’t cooler better when it comes to oil?

I have a 29ft, semi displacement hull with 315 hp turbocharged Yanmar diesel (6LYA-ute). WOT is about 3450rpm, but for both comfort and fuel efficiency I mostly run at hull speed, which is about 1300 rpm, at which rpm I wonder if the turbo is even spinning. Will this damage the engine or the...

What about Awlgrip painted surfaces? Either of these products safe for that?

When using vacuum full technique, do you have to heat up the engine first? Joe do you deal with the thermostat?

So it is oft repeated that diesels cost more to maintain than gas engines. Why? Diesel seem simpler…no ignition system for one. In both engines valves need adjusting, cooling systems similar, exhaust systems similar. Diesels fussy about fuel filtration, sure, but I’d that the additional cost...