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I have a quick question. I have a 1987 Argo 8x8 I/C with tge 18hp Kohler Magnum in it. So in the summer months it says to run 30W when temperatures are above 32 degrees. When temps are below 32 it says to run 5-20W. So my question is, at what temp is it still okay to run the 30W oil. I only use the Argo once or twice in the winter due to my schedule and I certainly won't go out when it's below zero. Will running 30W when it's colder hurt anything? Any thoughts would be appreciated. Thanks in advance.
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We've got three of those and we just shove engine oil in, couldn't tell you what grade. After all the years it's been run I don't think it's possible to do any more abuse than they've already had
Having said that, I think it's far more important than choosing an oil grade to let an engine, any engine, tick over for a few minutes after starting ............. and before turning it off. It just lets everything settle down and warm up, or cool down, nice and gently. -
In cold weather you risk not being able to pump the heavier oil when it is thick and not having adequate lubrication until the oil gets warm enough to flow. In hot weather, the 5W20 may lose viscosity and not provide enough protection.
You could just change oil twice a year and run a 5W20 in the cooler half of the year and 10W30 in the warmer half. The multi viscosity oils will give you some cushion around the boundary conditions.Comment
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HI
If u use a 10w/30, use only the full synthetic variety
A synthetic oil will typically flow better than a mineral .There is a huge difference in flow ability between brands .
A quality 10/30 should be suitable for 98% of use
The synthetics should [u need to check with the maker ] have high amount of zinc and moly . This is to prevent wear in OHV /camshaft lifters.
An engine oil always needs to flow and warmup before it is used .
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