Has a miss and oil leak suddenly. About half a quart just by moving it.

Check your water for oil contamination. Might be the head gasket.

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www.snowest.com/forum/archive/index.php/t-44412.html

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I have an oil leak - HCS Snowmobile Forums

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That's the oil filter cooler seal. My car did the same thing; poured a quart of oil out on the ground in about a minute while I was looking for the source of the leak.

There's a box with radiator fluid going through it mounted between the oil filter and the block to cool the oil. It's got a large o-ring to seal it, and when that seal goes, it just *pours* oil out. Take the oil filter off and you'll see a large nut. take off the nut and the cooler will slide off - you can do that without removing the fluid lines.

The seal is between the block and the cooler and will be very obvious when it's bad; mine was missing a big chunk out of one side. Popped a new seal in, put it back together and haven't had a problem with it since.

replace the valve stem seals

If there is oil in water, then there may be a head gasket leak. However, half a quart of oil loss every 15,000 mi. is not bad. If van runs perfectly, then I wouldn't worry too much about it. Maybe try some Bar's Leaks Head Gasket Repair for $30 or so to fix the slow leak in the coolant system.

Around 4 and a half plus at least a nother half for the oil filter . Look at the dip stick it has an opperating range above where it says add. As long as your in this range your Ok . Don't over fill it that may gum up your vavle train and cause leaks . If you do the oil filter you fill it then check the dip stick then start it then shut it down check the dip stick again and add oil as required to be in the opperating range and the job will be done corectly.

You check the oil when it is off and has sat for at least 20 mins. Your car should take 5 quarts when you have no oil in it.

have that checked ASAP. its going somewhere.

most likly the trans is just plain worn out you could have it rebuilt or replace it with a used one

Check the Seal around the Oil Pan Drain Plug. If this Seal is Missing or Warped it will slowly leak oil.