I know a lot of folks that run castrol gtx 10w-40 in their atv's including myself. It's a very good inexpensive oil that does not make your clutch slip. Stay away from moly additves and oils with friction reducers. I run castrol in all our quads. $1.50 quart is not bad!

Everything you wanted to know about oil...

 

That's interesting, this oil is designed for use in extreme duty diesels. Quads see a lot of extreme use as far as gas motors go.

Chet

 

I used 20w-50 Castrol GTX in a borrowed honda xr500. I went through about 30 gallons of gas before I gave the dirtbike back and the clutch never slipped once or burned up. Most 20w-50 oils are fine. It is only the lighter weight oils that contain friction modifers.

JaMeS

 

I only use the gtx 20/50 in my machines. The yamaha dealer would rather sell me yamalube, but my Honda dealer recommends the 20/50. In fact the GTX 20/50 is the only oil he keeps in his dealership. Every bike that comes in for an oil change gets it.

Ted

 

I still use OPTI oil. Its expeensive, but I only need to change the oil once a year, maybe twice for the amount of riding I do. A little extra for good oil will not break me!! We have a 15 year old Honda 1000w generator that has thousands of hours on it and it still runs like a champ, I attribute alot of this to the Opti.

 

action450s,

I did a google search and found the OPTI oil you describe. I had not heard of this brand of oil before.

Chet

 

THEMOOSE:
Why do you check this out:

http://www.nightrider.com/biketech/oiltest1.htm

What's the sense in spending more with you get nothing in return?

 

OPTI 4 is the oil carried by my local HONDA dealer. Blue botle white cap. 4l jugs are clear/white.

On the bottle: Product of Interlube international, Inc. Made in USA, Bellingham, WA. 98225

They also make 2 stroke oil as well. Since I don't own a 2 stroke I've never bought it.

 

Who the hell wants to pay 6 bux a quart 4 the special oil, castrol gtx 10-40 will be fine

 

I used to sell the Opti stuff. I've been using it for 17 years. Not only do I have tons of eqipment with a lot of hours because of this oil , I have a 1996 Chevy S10 with 375,000 miles on it. Doesn't use much oil and still pretty strong. I ran this oil for the first 10,000 miles and regular API rated oil since.

BTW, any oil with the cold vs hot designation, (10W-30, 5W-30 etc.) has thinner oil and has viscosity enhancers. It's the only way you can get oil to flow in the colder months. If you aren't running in really cold weather, stick with basic SAE 30 40 or 50 weight oil.

The Opti stuff is pretty amazing stuff and worth every penny you'll spend on it.