CO_Farmer
Member
At a Harley dealer- LOL.
I've got a somewhat tired YM2500 that still runs well, doesn't use any oil.
What was concerning me most is that when hot, oil pressure was dropping down to 15 PSI or less at 2,000 RPM. I had been using one of the 15W-40 name brands of diesel oil with a can of STP or Bardahl added, probably making the equivalent of a 20W-50 or the like.
I noticed in my manual that Yanmar recommended a straight 50 weight oil in the warm seasons. Never saw any at the local auto parts stores, but Harley-Davidson dealers sell a premium straight 40, 50 and 60 weight motor oil for about $4/qt. Changed to the Harley straight 50 today, made a huge improvement in oil pressure when hot. Never got below 25 PSI while grading the road when it used to drop to 15 PSI or a little less. AND the engine had noticeably less clatter.
In the winter, I'll go back to the multigrade, but I am really impressed with the performance of this straight-grade oil. Just the ticket for the worn bearings.
Now all I need are some chromed straight pipes...
I've got a somewhat tired YM2500 that still runs well, doesn't use any oil.
What was concerning me most is that when hot, oil pressure was dropping down to 15 PSI or less at 2,000 RPM. I had been using one of the 15W-40 name brands of diesel oil with a can of STP or Bardahl added, probably making the equivalent of a 20W-50 or the like.
I noticed in my manual that Yanmar recommended a straight 50 weight oil in the warm seasons. Never saw any at the local auto parts stores, but Harley-Davidson dealers sell a premium straight 40, 50 and 60 weight motor oil for about $4/qt. Changed to the Harley straight 50 today, made a huge improvement in oil pressure when hot. Never got below 25 PSI while grading the road when it used to drop to 15 PSI or a little less. AND the engine had noticeably less clatter.
In the winter, I'll go back to the multigrade, but I am really impressed with the performance of this straight-grade oil. Just the ticket for the worn bearings.
Now all I need are some chromed straight pipes...