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Oil wt question

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Person was running 5 / 40 synthetic on this ktm I just bought. I see book recommends 10 / 50.

What is the difference? Should I change oil sooner than later as it was just changed before I bought.

What should I run?

thx.

Edited by bobback

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Don't see a huge difference personally. I know the book wants 15W50 Motorex full synthetic but I run Amsoil 10W40 full synthetic year round in both sides and it does great. I use it in the higher revving 4-strokes too (higher revs than the torque monster 530)

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10w/40 seams to be the most popular. thats for a reason cause it suits all engines lol

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I'm going to go w/ Dumende Tech 400yap 15/40...thanks to "kaptenken's" recommendation!

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I'm going to go w/ Dumende Tech 400yap 15/40...thanks to "kaptenken's" recommendation!

When I asked about a good cheaper option to Motorex this ^^ was what they recommended. I have only run it for a few minutes so far, but am sure it will do fine.

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