What engine oil do you use?

[Drawmer]

Just curious, or another thing to read about. I'm in Singapore so temp is about 30deg C

[Maverick]

I use 10w/40 grade all year around and seems to be fine in the UK. Warmer climates such as where you are could probably use thicker grade oil as it should not be influenced by the weather so much.

[samih]

Hot weather shouldn't bee too bad for the oil, just keep an eye on (possible) oil consumption. Maybe something like 20W50 would reduce thirst for oil if you have to topup using 10W40. AT has a pretty large oil cooler to make it easy for the black stuff.

Synthetic might as well be useful, although the most benefits are shown in extreme cold temperatures. Again, thirst for oil especially towards the end of the service could be reduced using the expensive stuff.

[kiroh]

Silcoline Super 4 10W-40, fully synthetic. Change oil and filter every 6k miles.

[c stillythemanwivno]

extra vergin olive oil .................. it rocks

[YEN_POWELL]

Castrol GPS (semi synthetic I think). Changed every 5,000 miles or so.

[BobA]

In my RD03 I used fully-synthetic, 15W50 Motul factory line

I don't know if it was my imagination, but it run and idled much smooother, and there was absolutely NO signs of slipping clutch, which is the usual fully-synthetic worry.

Bob

[robelst]

Any bottle that has the words "motorcycle", "10/40" and "oil" on it.
And after 5k it is time for another couple of those

[Lord Stig]

I use car diesel oil, 15w40 in the summer and 10w40 in the winter. Thinner oil (e.g., 5w40 and less) seems to burn off quickly, needing frequent top ups. I change oil every 4,000 miles, with a new filter every other change. Oil formulated for diesels has a high phosphorus content but lacks frictions modifiers that can cause the clutch to slip. Most other car oils have them, but bike oils don't for that very reason.

At first putting diesel oil in seemed a bad idea - diesels are slow and grind around the countryside in a pall of black smoke, don't they? Well, the oil in a diesel has a HELL of a lot harder time than in a petrol engine. They run higher compressions, most have turbos or intercoolers these days, and they have to resist the viscosity rising with soot contamination (admittedly not a problem for the average bike!). I've used it for (I think) a bit under 30,000 miles with no apparent signs of accelerated wear, and I'm on 64,500 at the moment. You can buy the stuff a lot cheaper than the overpriced bike stuff, and I would have thought it's a whole lot easier to get hold of where you are. I'd use 15w40 for the heat, but 10w40 should be fine as well.

My ten penneth....

Stig

[robelst]

I have used diesel car oil (Castrol GTD) in the Buell for over 35k. I just hate visiting Harley dealers, while Castrol can be found at my local Tesco. I also use car oil-filters (made by Fram) from the web or Halfords, not sure if they do one for the AT though? But then of couse a Buell is a bit like diesel isn't it?