drain oil when warm or cold?

On a 08 yz450. The manual says to run the bike for a few minutes and then drain the oil. Do you guys do it this way? I was thinking if I was to drain it when cold the oil would already be down in the bottom of the engine.

I also have a question about oil specs. I plan on using Spectro Golden4 semi-synthetic 10w40. I think a read that this is one of the oils that Greyracer recomends as proven to hold up? The manual calls for API sg or higher, JASO standard MA. The spectro says API sl. Meets MA. Is this oil specification meeting the requirements?

That oil is fine. By running the engine before draining, you coat the internals with oil, which helps it endure restarting afterward, when it will have no oil pressure for perhaps 10 full seconds.

Warming the engine makes the oil flow out easier, and also churns up any particles that may be laying in the bottom, so they will come out with the oil.


Is the Spectro golden4 semi synthetic an oil I can run safely for 8-10hrs? What does the API SL mean? Is it a higher rating than API SG?

Is the Spectro golden4 semi synthetic an oil I can run safely for 8-10hrs? What does the API SL mean? Is it a higher rating than API SG?
Pushing beyond 8 hours is not something I recommend on a regular basis, but it can be done occasionally with an oil such as those I named, including Spectro 4.

SL is supposed to be inclusive of all earlier grades, but has a lower level of phosphorus bearing anti-wear compounds, those having been removed due to their effect on catalytic converters, and replaced by compounds based on molybdenum instead. These are not friction reducers, per se, and Spectro is still JASO MA, so it's perfectly OK for your clutch.


Thanks again Greyracer. I want to run the longest lasting oil available. And from what I remember reading on here you had experience with spectro, amsoil and mobile 1 as long lasting. From what I have found I can get the spectro the cheapest at $9.00 per liter. I would run Amsoil based on your experience, but it looks like it is about $15.00 per quart.

When it comes to oil or lube, I always do them when things are warm. Change oil when engine warm. Lube chain after chain is warm/ridden.

I would run Amsoil based on your experience, but it looks like it is about $15.00 per quart.
Not if you go to Amsoil.com and sign up as a preferred customer. Retail is supposed to be $10.35 currently anyway.
Lube chain after chain is warm/ridden.

I prefer to clean it thoroughly before lubricating

I always install magnetic oil plugs in my bike. You won't believe how much metal collects on it.:excuseme:

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