What oil in crankcase of dt175 about 88 model

It is a 2 stroke engine. The crank is lubricated by the oil in the fuel.

Google

make model manual

https://www.google.com/search?q=crankcase+oil%2C+2017+troy+bilt+weed+eater

..

This (normally) comes from the piston moving inside the cylinder displacing air inside the crankcase.

Nearly the same volume of air that is compressed by the piston/cylinder/head (engine displacement) is likewise displaced inside the crankcase. There's just no significant compression on the crankcase side of the piston. The typical modern 4 cycle small engine crankcase is vented to the intake manifold to relieve crankcase pressure.

With the oil/fill cap properly seated, nominal crankcase pressure will not move the cap.

Too much crankcase pressure for some reason? I've seen a melted piston cause so much crankcase pressure, it blew the pcv valve out of the valve cover and sprayed oil all over the engine compartment.

Is your oil cap threaded? If it is threaded, I don't think I've seen one of them blow off? Also, check crankcase ventilation system, pcv where applicable. Do you have a lot of blow-by from crankcase? I don't know your year--make--model or engine size?

It doesn't inject oil into the crankcase on a 2 stroke. It is mixed with the petrol at the carb. But, it is difficult to tell you how to check it as you haven't said the make and model of your bike!?!?!

in dusty conditions the crankcase breather will clog , in which the crankcase builds excess causing oil to be forced by the rings.
clean the crankcase breather.

This engine holds one quart of standard Yamaha YZ 250 engine oil. The oil filter is located on the rear of the crankcase behind the suspension spring. The oil filter looks like a small metal can that is screwed into the top rear of the crankcase. On the bottom of the crankcase is the plug that will need to be removed to drain the oil from the crankcase. Anyone who owns this model dirt bike can complete this job in about 10 minutes.
Read more: How to Change Oil and Filter on a Yahama 250F ' eHow.com http://www.ehow.com/how_6574975_change-oil-filter-yahama-250f.html#ixzz1hECQRtAn

Here is an owners manual for model 316791961 (7.99 mb)
http://www.managemylife.com/mmh/lis_pdf/OWNM/1012092L.pdf

Parts listing 316791961
http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Grass-trimmer-weed-wacker-Parts/Model-316791961/0247/1503820?sid=MMLxMerchandizexManualsModelxx316791961

Oil: (SAE 30 3.04 Oz.)

ADDING OiL TO CRANKCASE: iNiTiAL USE

NOTE: This unit is shipped without oil. In order to avoid damage to the

unit, put oil in the crankcase before attempting to start the unit.

The unit is supplied with one 3.04 fluid oz. (90 ml) bottle of SAE 30 SF, SG,
SH oil (Fig. 6).

Thanks for choosing FixYa,
Kelly

On your '93 model, the crankcase vent is down low on the engine behind the oil pump and it runs up to the air filter through a metal and rubber hose. I don't know how many miles you have on your engine but it you're getting any blow-by on the rings, this will increase the pressure in the crankcase. Most people simply re-route the crankcase breather underneath the bike and plug the hole on the backside of the air filter. Replace the metal line with a rubber hose and put a small filter in the end of the hose. Route the hose back behind the transmission and attach it to the transmission mounting plate just in front of the rear wheel.

This was the way the older Shovelheads were done from the factory for years until the EPA made them start running the crankcase vented air through the engine. In 1994, Harley went to the "head breather" system and moved the crankcase vents to the heads. Still, the oil mist in the vented air builds up in the air cleaner on these models as well.

Good Luck
Steve

not for crankcase means do not use it as an engine oil in lets say a lawnmower engine
yes it is ok to use only as bar and chain oil and if it is a automatic oiler be sure it is oiling.

any small compressor oil will do like dewalt,quincy....or 30 sae oil