Best engine oil By lennie11b (Read 2,337 times)

[lennie11b]

My scoot has a little oil leak it has 88 miles on it what should i put back in it

[cruiser]

The first thing to do is determine where the leak is. It could be from the valve cover gasket or the breather hose is loose or from the drain plug. Generally these are all easy fixes. It could also be leaking from the engine case or even a bad crankshaft seal. These are not so easy to fix. Try to pinpoint the location and that will determine how to fix it.

[lennie11b]

looks like it's coming from the bottom somewhere

[alleyoop]

Did you recently do an OIL change? If so it could be leaking by the Oil Drain Plug. If you see it is wet by the middle of the Case where they go together it may be the gasket and or loose case bolts. You really have to pinpoint where it is leaking from it could be from a few places. So wipe it clean and see if you can find where it is leaking. When it leaks the oil blows all over the place when you riding so it makes it a little harder to pinpoint.
It could also be the cover behind the Flywheel and Stator, if it is leaking from there the fan blows it forward under the shroud.
Alleyoop

[lennie11b]

I'll look at it tomarrow is 15-40 ok thats what im hearing is good.

[blueboy5000]

15w40 or 10w40 is the best viscosity. There isn't any evidence that a particular brand makes much difference. I like Mobil 1 4t 10w40 fully synthetic motorcycle oil, but only because I used that brand in my motorcycles. There is no reason to spend the money on motorcycle oil because our scoots don't have wet clutches and don't need the extra additives. Walmart oil is probably fine.

I've heard good things about Royal Purple as well.

I'm getting ahead of myself. Your bike is just breaking in, so dino-oil is probably best for the first 800 miles.

Remember that synthetic oil is thinner than dino oil when it warms up, so it has a higher potential for leaks.

[lennie11b]

Thats why i think i have a leak not broke in and synthtic oil

[blueboy5000]

Well, you shouldn't be leaking period. Yes I will agree that since it is of a SLIGHTLY lower viscosity, synthetic can possibly leak in a situation where organic oil might not.

But a leak is a leak. If you observed a leak while running synthetic, then it's probably still going to leak after an oil change to organic oil.

No leak is good! These engines actually generate a fair amount of oil pressure, so any oil leak is inevitability going to become worse, and fairly rapidly too boot.

There's not much good speculating where the leak is. You gotta find it with 100% certainty and fix it.

A good method is to use a garden hose and some "Foamy Engine Brite". Apply the degreaser and rinse off with moderate pressure water. (Do not spray wiring connectors, coil or carb with direct streams of water, I usually put a sandwich bag and a rubber band over the carb and coil). Then blow dry with compressed air, or let dry completely.

Then put the bike on the centerstand and let it run for ten minutes. You should have NP finding the leak.

Good luck!

[blueboy5000]

If you wanna get fancy with science, then go to a professional autoparts store like Napa or Car Quest (not a DIY parts store like Autozone or Pep Boys) and get some U.V. leak tracer. Put the tracer in the engine oil and run it for 15 minutes.

Then take your bike to a dark area, or wait till night, and shine a black light on the engine. The tracer dye will glow blue, making finding the leak easy.

This method, is overkill. But it's dead accurate. After using tracer dye you MUST replace the oil.

These bikes use 750 ml exactly of oil. Too much oil, and the excess blows. out of the crankcase vent.

[tankrider]

I use strictly Castrol GTX 10-40 in my Tank. In the heat of the summer I switch over to 20-50. I'm hoping that's why I've gotten so many miles on it.

[rp62]

Jun 4, 2012 13:44:31 GMT -6 alleyoop said:

Did you recently do an OIL change? If so it could be leaking by the Oil Drain Plug. If you see it is wet by the middle of the Case where they go together it may be the gasket and or loose case bolts. You really have to pinpoint where it is leaking from it could be from a few places. So wipe it clean and see if you can find where it is leaking. When it leaks the oil blows all over the place when you riding so it makes it a little harder to pinpoint.
It could also be the cover behind the Flywheel and Stator, if it is leaking from there the fan blows it forward under the shroud.
Alleyoop

Hi Alleyoop,

I’m quoting your post because it describes my process to pinpoint an oil leak on my 150 cc, 16 in wheel scooter, with 4500 Kms. Finally, I’m almost sure the oil is coming out of the crankshaft behind the Flywheel and Stator. I’ll be completely sure when I get the tool the dismount those parts. I guess there is an oil seal on that case cover and around the crankshaft. Please let me know how to fix this problem. I haven’t found any video about this particular oil seal.

Also, I would like your comments on the possible causes for the oil leak. I have read that Synthetic oil and also a pinched valve cover vent line could be it. In fact, this is the first time I’m using Motul Synthetic oil, and the vent line is somewhat bent by the rear fender just where it access the air box.

Thank you in advance,

rp62

[JR]

Apr 4, 2015 12:37:00 GMT -6 rp62 said:

Jun 4, 2012 13:44:31 GMT -6 alleyoop said:

Did you recently do an OIL change? If so it could be leaking by the Oil Drain Plug. If you see it is wet by the middle of the Case where they go together it may be the gasket and or loose case bolts. You really have to pinpoint where it is leaking from it could be from a few places. So wipe it clean and see if you can find where it is leaking. When it leaks the oil blows all over the place when you riding so it makes it a little harder to pinpoint.
It could also be the cover behind the Flywheel and Stator, if it is leaking from there the fan blows it forward under the shroud.
Alleyoop

Hi Alleyoop,

I’m quoting your post because it describes my process to pinpoint an oil leak on my 150 cc, 16 in wheel scooter, with 4500 Kms. Finally, I’m almost sure the oil is coming out of the crankshaft behind the Flywheel and Stator. I’ll be completely sure when I get the tool the dismount those parts. I guess there is an oil seal on that case cover and around the crankshaft. Please let me know how to fix this problem. I haven’t found any video about this particular oil seal.

Also, I would like your comments on the possible causes for the oil leak. I have read that Synthetic oil and also a pinched valve cover vent line could be it. In fact, this is the first time I’m using Motul Synthetic oil, and the vent line is somewhat bent by the rear fender just where it access the air box.

Thank you in advance,

rp62

May sound weird but I've heard of and had a scooter start leaking oil by just the start of using synthetic oil. I had a 150 with over 3k on it, never leaked a drop, change to synthetic and a week late had oil seeping out of the bottom jug gasket. Had to pull it apart and replace the gaskets, went back to good dino oil, never leaked again.

JR

[rp62]

Thank you JR!
It really sounds weird. But it looks like another case adds up to the urban legend.
By the way, I have a doubt about 4T engine oil. Is there a difference between 4T Motorcycle engine oil and 4T Scooter engine oil? I have seen both oils commercialized by same brands.

[JR]

Personally I don't think so, I use Castrol dino oil, never had any troubles.

JR

[rp62]

Thanks again JR!

Regards,

rp62