0W30 Engine Oil

unixxx · **Posted:** Wed Jun 27, 2007 3:39 am

Does anyone run 0W30 engine oil in their Libby? I'm not sure whether or not I want to run AMSOIL Series 2000 Synthetic 0W30. Maybe John can tell me why the Series 2000 oil is better.

JJsTJ · **Posted:** Wed Jun 27, 2007 2:27 pm

Well, if you are worried about your four balls wearing out :shock:

it sure is better than other brands....

And I am pretty sure that if X brand of 0W-20 is good enough for all the new cars on the market that 0W-30 from Amsoil is Way better for sure.
The 3.7L KJ engine or 3.8L JK engine hasn't changed from when it spec'd 5W-30 so apparently thinner oil is Ok. IT is funny that Amsoil has been touting that lighter oil can be fine if not better and now the auto mfg's are coming around to it.

Guest · **Posted:** Wed Jun 27, 2007 3:35 pm

I would not use 0W-anything, unless the manual said specifically to use it! Not merely that it is acceptable or tolerable, but that it is the weight of choice! It has a viscosity like water. It is VERY thin, & it will likely find places to leak that a 5W-30 (which is the recommended weight for the KJ) just won't fit through.

I used it in my BMW for about 1000 miles & that was exactly what happened, & the engine ran a bit louder & harsher as well. It is also a 5W-30 car.

JJsTJ · **Posted:** Wed Jun 27, 2007 3:59 pm

New KJ's and many other vehicles including the JK specify 0W-20 and they don't develop leaks any worse than any other. If a 0W is going to leak from an engine the chances are Real good that a 5W will too.
I have personally seen engines go from 5W to 0W and back and not leak. IT is a non-issue in an engine that has good gaskets and seals.

Guest · **Posted:** Wed Jun 27, 2007 7:26 pm

JJsKJ wrote:

New KJ's and many other vehicles including the JK specify 0W-20 and they don't develop leaks any worse than any other. If a 0W is going to leak from an engine the chances are Real good that a 5W will too.
I have personally seen engines go from 5W to 0W and back and not leak. IT is a non-issue in an engine that has good gaskets and seals.

As long as it's called for... that is all that matters.

My BMW is a 94 with 165,000 miles at the time I used the 0w-20. The valve covers only had about 15K leak-free miles when the 0w-20 started leaking. The 0W-20 is significantly & noticeably less viscous than 5W-30. You can see that when you pour it. Just my personal experience I'm sharing here!

dieselenthusiast · **Posted:** Fri Jun 29, 2007 11:50 pm

I ran Amsoil 0W30 in my 1995 Chevy Tahoe, I sold it with 257,000 on it. I changed the oil once a year because I never met the high mileage interval. I also run the 5W30 in my Dodge Cummins 12 quart capacity. Many “uneducated” people think it’s going to ruin the engine. Those type of people are speaking from myth, not fact. The 0W30 protects better than the 5W30 if that tells you anything. I run Amsoil 0W30 in the Liberty as well. The 0W30 has better cold weather and hot weather protection and doesn’t break down as fast as the 5W30 which is to be changed every 6 months or 7500 miles. There is no doubt in my mind that the 3.7L can clock in over 300,000 miles with normal wear on the motor if you run Amsoil products and keep everything changed as recommended.

DarbyWalters · **Posted:** Sat Jun 30, 2007 12:09 am

Well an 0W-30 is thicker than a 0W-20 ever would be so I don't get the point of bringing up "leaking". The 0W would come into play during start-up and cold weather. Once the oil gets to about 205-215 degrees the heavier (30) number would be working (flowing properly).

Guest · **Posted:** Sat Jun 30, 2007 2:18 am

KJpilot wrote:

I would not use 0W-anything, unless the manual said specifically to use it! Not merely that it is acceptable or tolerable, but that it is the weight of choice! It has a viscosity like water. It is VERY thin, & it will likely find places to leak that a 5W-30 (which is the recommended weight for the KJ) just won't fit through.

I used it in my BMW for about 1000 miles & that was exactly what happened, & the engine ran a bit louder & harsher as well. It is also a 5W-30 car.

Actually, above 0 degrees my manual for my '02 says to use 10w30 OR 5w30. I dont' remember what the cut-off point is for 5w30, but it's recommended to something like 30 below. Go figure, though, I have my manual right in front of me and I can't find it, D'OH. has a nice little chart and EVERYTHING!

the1jferg · **Posted:** Sat Jun 30, 2007 10:13 am

The book recommends higher viscosity fo hotter weather on the chart? They do overlap some though.

My motor is quieter on startup with 10/30?

How about straight 30w for summer or texas?

Whats wrong with slick 50?

I ran a Volvo for 2 months with slick 50 and no water in the system for cooling. When I gave it away it was still running fine.

Guest · **Posted:** Sat Jun 30, 2007 10:40 am

they do overlap, but for some odd reason I can't find the nice little chart in the manual now. in Phoenix I also ran 10w30...straight 30wt might be a little much on startup on a cold engine (even though it may be 130, that's still a cold engine, LOL), BUT I'm no engine engineer, and that's why i consult the manual

dieselenthusiast · **Posted:** Sat Jun 30, 2007 10:56 am

Fuel Efficient Formula
AMSOIL Synthetic 0W-30 Motor Oil efficiently transfers energy from the engine to the drivetrain. Its low coefficient of friction inhibits the energy loss to “drag” common to high viscosity oils.

Motorists seeking the ultimate in fuel efficiency may use AMSOIL Synthetic 0W-30 Motor Oil in place of 5W-30 or 10W-30 motor oils.

High Temperature Protection
AMSOIL Synthetic 0W-30 Motor Oil protects in high temperatures better than the conventional and synthetic oils tested. Even after extended service in the engine, AMSOIL Synthetic 0W-30 Motor Oil maintains its ability to protect in high temperatures.

Low Temperature Protection
AMSOIL Synthetic 0W-30 Motor Oil is specially formulated for superior cold temperature engine protection. It retains excellent fluidity in extremely low temperatures, so it flows quickly and reliably to allow easy starting and immediate lubricating protection.

Motorists seeking cold temperature dependability and protection may use AMSOIL Synthetic 0W-30 Motor Oil in place of 5W-30 or 10W-30 motor oils.

Heat Stability
AMSOIL Synthetic 0W-30 Motor Oil is highly resistant to volatility. For example, in heat that causes conventional motor oils to lose as much as 25 percent of their mass, AMSOIL Synthetic 0W-30 Motor Oil loses less than 10 percent.

AMSOIL Synthetic 0W-30 Motor Oil’s resistance to volatility keeps oil consumption extremely low and, more importantly, keeps the engine thoroughly lubricated and protected. Its resistance to volatility also helps keep fuel efficiency high and emissions low.

Clean Engine Formula
AMSOIL Synthetic 0W-30 Motor Oil is durable and resists sludge, varnish and other by-products of high-temperature degradation. With no deposits to foul them, engines stay cleaner longer for top performance and efficiency and maximum service life.

Shear Stability
AMSOIL Synthetic 0W-30 Motor Oil is shear stable. With AMSOIL Synthetic 0W-30 Motor Oil’s excellent viscosity retention, the protection that goes into the engine is the protection that stays in the engine, even over an extended course of severe service.

0W30 Engine Oil

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