From:Tom Wilcock e-mail:twilcock@hotmail.ca
Subject:RE: oil for early K Date:Sun Aug 24 06:27:17 2014
Response to:5314
Graeme: My theory is that these old engines depend on lots of oil being splashed up on the cylinder walls and underside of the pistons to help in cooling. A lighter oil will give you more flow through the bearings with the result of more oil being thrown up to the top end. I have always used 10W40 in my 1940 Indian 4 with no issues. I have over 70,000 miles on the engine and it still shows 40 psi oil pressure. The Indian oil pump has a bypass. I think it is better to have more oil going through the bearings than out the bypass. My KJ is in the works and I plan to use the same 10W40 in it as well. This is just my idea so don't try this at home. Tom

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it's hard to buy stright 50 weight oil and with modern technology why wouldn't one use a multigrade oil? Question is what do people out there recommend these days folks?