Ms 660 what type of bar oil should I use in cold weather ?

you do not mention if automatic or manual so I will give you freezing points for atf and gear oil
the freezing point of atf oil used in automatic transmissions is -62.5 degrees F so unless the oil is very old and is contaminated with water the oil would not be frozen
gear oil(Shell used in diffs and gear boxes 68 grade ) has a pour point of-24 degrees c
however as a petroleum product, all types of non-synthetic oil will not freeze solid
if you mean that the gear selection was impossible then it may be tolerances that are affected by the cold
how to stop it--- possible to house the car in an insulated garage with a simple bar heater operating to keep the room above freezing point

do you mean trans gear oil if so you can use 80 weight oil or automatic transmission oil in a standard trans, since its getting to colder weather and will help with easier sifting in the cold weather.

IF YOU HAS GAS ENGINE USE API CERTIFIED FOR GAS ENGINES USE 5W 30 FOR COLD WEATHER. YOU CAN USE 5W 40 FOR WARM AND HOT CLIMATE. FOR DIESEL ENGINE YOU NEED API SERVICE CF4 OR CG4 USE MOBILE 1 OIL 5W 30 COLD WEATHER AND 5W 40 FOR HOT CLIMATES ALSO CHECK IN OWNERS MANUAL.TO BE ON THE SAFE SIDE OR ASK THE AUTO PARTS SALESPERSON TO LOOK UP TYPE OF OIL YOU SHOULD USE TO KEEP FROM DAMAGING THE ENGINE IF YOU HAVE TURBOCHARGER.

Hello,

Visco 2000 or mobil oil, use the dipstick to check do not let it be too full.

The type specified by the vehicle manufacturer in your owner's manual. For most passenger car and light truck gasoline engines today, it's any oil that meets the American Petroleum Institutes "SH" rating.
As for the viscosity of oil to use, most new engines today require a multiviscosity 5W-30 oil for all-round driving. The lighter 5W-30 oils contain friction reducing additives that help improve fuel economy, and also allow the oil to quickly reach critical upper valvetrain components when a cold engine is first started. Most engine wear occurs immediately after a cold start, so it's important to have oil that is thin enough to circulate easily -- especially at cold temperatures.
For older engines and ones that are driven at sustained highways speeds during hot weather, 10W-30 or 10W-40 is a good choice. Heavier multiviscosity oils such as 20W-40 are for high rpm, high-load applications primarily and are not recommended for cold weather driving.
Straight weight 30W and 40W oils aren't very popular anymore, but some diehards insist on using them. They say the thicker oil holds up better under high temperature (which it does), increases oil pressure and reduces oil consumption in high mileage engines. But straight 30W and 40W oils are too thick for cold weather and may make an engine hard to start. They may also be too thick to provide adequate start-up lubrication to critical upper valvetrain components during cold weather. So switching to a straight 20W oil would be necessary for cold weather driving. Straight 10W oil can also improve cold starting, but is very thin and should only be used in sub-zero climates. A multiviscosity 10W-30 or 10W-40 will provide the same cold starting benefits of a 10W oil and the high temperature protection of a 30W or 40W oil.
For the ultimate in high temperature protection, durability and all-round performance, synthetic oils are the way to go. Unfortunately, most synthetic oils cost up to three times as much as ordinary petroleum-based oils. They cost more because synthetics are manmade rather than refined from petroleum. But this improves their performance in virtually every aspect:

• Superior temperature resistance. Synthetics can safely handle higher operating temperatures without oxidizing (burning) or breaking down. The upper limit for most mineral based oils is about 250 to 300 degrees F. Synthetics can take up to 450 degrees F. or higher. This makes synthetics well-suited for turbo applications as well as high rpm and high output engine applications.
• Better low temperature performance. Synthetics flow freely at subzero temperatures, pouring easily at -40 or -50 degrees F. where ordinary oils turn to molasses. This makes for easier cold starts and provides faster upper valvetrain lubrication during the first critical moments when most engine wear occurs.
• Better engine performance. Synthetics tend to be more slippery than their petroleum-based counterparts, which improves fuel economy, cuts frictional horsepower losses and helps the engine run cooler. The difference isn't great, but it can make a noticeable difference.
• Longer oil change intervals. Because synthetics resist oxidation and viscosity breakdown better than ordinary motor oils, some suppliers say oil change intervals can be safely extended -- in some cases stretched to as much as 25,000 miles. Such claims are justified by the fact that synthetics don't break down or sludge up as fast as ordinary mineral-based oils do in use. CAUTION: For vehicles under warranty, extending the normal change interval is not recommended because failing to follow the OEM's maintenance schedule can void your warranty.
  Synthetics are available in the same grades as ordinary motor oils (5W-30, 5W-20 and 10W-30) as well as "extended" grades such as 15W-50 and even 5W-50.
  There are also lower-cost synthetic "blends" that combine synthetic and petroleum-based oils in the same container. But you can do your own blend to save money by simply substituting a quart or two of synthetic oil for conventional oil when you change oil. Synthetics are compatible with conventional motor oils.
  Who should use a synthetic oil? The premium-priced oil is best for:
  
  • Turbocharged or supercharged engines
  • Performance or high output engines
  • Vehicles used for towing (especially during hot weather)
  • Vehicles that are operated in extremely cold or hot climates
  • Anyone who wants the ultimate in lubrication and protection
  • 
    

Take care and good luck

Use high mileage oil, Castrol or whatever you prefer. Warm and Hot weather, 10w40, cool or cold weather 10w30.

most cars now uses 5W - 30 for cold weather OR 10W-30. for hot weather. dont use synthetic oils it will void your warranty.

if you stay in cold weather, use 5w-30 for engine oil, if warm weather 10w-40 oil THOSE FOR ENGINE..

FOR automatic gearbox use type MERCON V atf or D III

ENGINE OIL

Caution
Never use non-detergent or straight mineral oil.
Oil Identification Symbol

Use only engine oils displaying the EOLCS certification mark on the container.
---------------------------------------------------------------------------
If these oils are not available, an API classification SH ECII or SH/CD EC11 can be used.

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Oil Viscosity

SAE 10W-30


NOTE
l SAE 5W-30 may be used for operation in very cold weather
areas where the lowest ambient temperature is below
- 10°F (- 23°C).

May be just the cold weather and condensation..if it goes away thats ok i think,, if it stays thats bad.... most cars show some type of smoke or something when they are cold....mine does .. and its fine... make sure its not pure thick blue smoke., for long periods.... that means ur burning oil...make sure to check ur oil and dont ever over fill it ....

synthetic very good year long and car start better in cold weather thanks pierre