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Synthetic 5w30. . .lol?
All the brands are about the same. If you are feeling a little chancy you might mix in a little 5w20. The lighter weight will create less resistance in the cylinders.
I'm sure this is true lol. I had to put some high performance pistons in a D15 the other day and I couldn't make the piston go using 30w, but I squeezed it in with 15.
Be warned. It may cause the engine to leak the lighter oil. I doubt it but it might happen. Also warning. If you go too light it might burn up the light oil before heavier oil can take its place.
Depends on how hot your engine gets. If it gets really hot a heavier fluid is probably best. If it stays very cool(sub 200) you might be able to go with a lighter fluid.
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