1-Gallon Castrol Assuron HD Diesel SAE 30 Motor Oil $8.04 + Free S&H w/ Walmart+ or orders $35+

Analog

Sep 9, 2021 10:45 AM

1.6K Comments

Joined Jul 2006

AnalogSep 9, 2021 10:45 AM

1.6K Comments

Good deal if you don't need multi-vis. My truck needs multi-vis due to the climate 4-seasons I encounter.

fantastic84

Sep 9, 2021 10:46 AM

312 Comments

Joined Apr 2016

fantastic84Sep 9, 2021 10:46 AM

312 Comments

I THINK this might be rated for Off road use only?

BBartow

Sep 9, 2021 11:18 AM

22 Comments

Joined Nov 2018

BBartowSep 9, 2021 11:18 AM

22 Comments

Good for the mower

5

gathermewool

Sep 9, 2021 11:43 AM

1.7K Comments

Joined Sep 2018

gathermewoolSep 9, 2021 11:43 AM

1.7K Comments

No ILSAC rating or API seal (old CF diesel rating is old). Not meant for motor vehicles. I'd say this is only good for Outside Power Equipment (OPE)

1

rogo178

Sep 9, 2021 11:46 AM

64 Comments

Joined Mar 2008

rogo178Sep 9, 2021 11:46 AM

64 Comments

Great oil to run on a generator in warm climate

1

coffeecandy

Sep 9, 2021 1:39 PM

247 Comments

Joined Mar 2009

coffeecandySep 9, 2021 1:39 PM

247 Comments

I have a tire machine that requires 30w oil, will this work?

80is

Sep 9, 2021 2:04 PM

15.7K Comments

Joined Nov 2010

80isSep 9, 2021 2:04 PM

15.7K Comments

perfect for frying eggs

1

3

Boink

Sep 9, 2021 3:08 PM

2.2K Comments

Joined Sep 2003

BoinkSep 9, 2021 3:08 PM

2.2K Comments

There's nothing like a quart of motor oil to get things moving after you've been bound up! #constipation

1

KMan

Sep 9, 2021 3:26 PM

7.5K Comments

Joined Nov 2006

KManSep 9, 2021 3:26 PM

7.5K Comments

Generally speaking, what makes motor oil suitable for diesel engines as opposed to gas ones, for the same weight and type? Is this mostly marketing?

1

Archimedes001

Sep 9, 2021 3:48 PM

798 Comments

Joined Nov 2005

Archimedes001Sep 9, 2021 3:48 PM

798 Comments

Our community has rated this post as helpful. If you agree, why not thank Archimedes001

Quote from KMan

:

Generally speaking, what makes motor oil suitable for diesel engines as opposed to gas ones, for the same weight and type? Is this mostly marketing?

API C service category (CK-4, CJ-4 etc.) has a completely different set of engine test specifications than an API S category (SP, SJ, etc.) for passenger cars.

What this means is the formulations are similar but diesel spec engine oils tend to have a lot more dispersant in there to handle soot and also usually higher ZDDP (antiwear) and detergents. They also tend to use a different type of viscosity modifier (usually a styrene type) that helps disperse soot and also has a really good shear stability as the drains on diesel oils is very long.

You could technically use a diesel spec oil in a passenger car as it is over formulated for those but... the drawback is if they have a high ZDDP level which could cause premature catalytic converter failure.

The other way around doesn't work, a passenger car oil couldn't survive in a diesel engine for a very long time. For a short period sure but not for the drains and the amount of soot those engines see.

That said this stuff is API CF-2, CF so it's old spec probably use it for lawn mowers or other random applications but not a modern passenger car or even a modern diesel.

Oh should also add that even modern CK-4 diesel oils do not have to pass the low-speed-preignition (LSPI) test so they might use all calcium based detergent systems which could be disastrous for your turbo GDI engines (VW, Ford ecoboost, etc.)

Last edited by MrMotorOil September 9, 2021 at 08:54 AM.

2

1

BlluittFW

Sep 9, 2021 3:51 PM

229 Comments

Joined Jul 2011

BlluittFWSep 9, 2021 3:51 PM

229 Comments

Quote from KMan

:

Generally speaking, what makes motor oil suitable for diesel engines as opposed to gas ones, for the same weight and type? Is this mostly marketing?

From what I've read is that the diesel formulations have higher zinc compound concentrations for increased anti-wear of the metal parts in the engine, but catalytic converters can't handle that higher concentration (sounds like it would clog them up early) so that's why it's not recommended for gas cars with cats.

I run the diesel version it in my outdoor gas engines - mower, tractors, etc since they don't have emissions / cats.

This is cheaper than the TSC jugs I buy so will grab a couple of these.

1

KMan

Sep 9, 2021 4:21 PM

7.5K Comments

Joined Nov 2006

KManSep 9, 2021 4:21 PM

7.5K Comments

Quote from MrMotorOil

:

API C service category (CK-4, CJ-4 etc.) has a completely different set of engine test specifications than an API S category (SP, SJ, etc.) for passenger cars.

What this means is the formulations are similar but diesel spec engine oils tend to have a lot more dispersant in there to handle soot and also usually higher ZDDP (antiwear) and detergents. They also tend to use a different type of viscosity modifier (usually a styrene type) that helps disperse soot and also has a really good shear stability as the drains on diesel oils is very long.

You could technically use a diesel spec oil in a passenger car as it is over formulated for those but... the drawback is if they have a high ZDDP level which could cause premature catalytic converter failure.

The other way around doesn't work, a passenger car oil couldn't survive in a diesel engine for a very long time. For a short period sure but not for the drains and the amount of soot those engines see.

That said this stuff is API CF-2, CF so it's old spec probably use it for lawn mowers or other random applications but not a modern passenger car or even a modern diesel.

Oh should also add that even modern CK-4 diesel oils do not have to pass the low-speed-preignition (LSPI) test so they might use all calcium based detergent systems which could be disastrous for your turbo GDI engines (VW, Ford ecoboost, etc.)

Quote from BlluittFW

:

From what I've read is that the diesel formulations have higher zinc compound concentrations for increased anti-wear of the metal parts in the engine, but catalytic converters can't handle that higher concentration (sounds like it would clog them up early) so that's why it's not recommended for gas cars with cats.

I run the diesel version it in my outdoor gas engines - mower, tractors, etc since they don't have emissions / cats.

This is cheaper than the TSC jugs I buy so will grab a couple of these.

Thanks, very detailed and informative. The only part I don't get is why this would affect the cat, since the oil is supposed to remain in the engine block. Are we talking blow-by and oil leakage into the combustion chamber, that over time affects the cat?

madmax718

Sep 9, 2021 5:32 PM

3.4K Comments

Joined Jul 2013

madmax718Sep 9, 2021 5:32 PM

3.4K Comments

Straight 30 diesel is often the speced oil for standby machinery that is stored in conditioned space, such as sheltered diesel generators and fire pumps.
It's also commonly speced on older farm equipment.

madmax718

Sep 9, 2021 5:34 PM

3.4K Comments

Joined Jul 2013

madmax718Sep 9, 2021 5:34 PM

3.4K Comments

Quote from KMan

:

Thanks, very detailed and informative. The only part I don't get is why this would affect the cat, since the oil is supposed to remain in the engine block. Are we talking blow-by and oil leakage into the combustion chamber, that over time affects the cat?

Diesel rated oils often has wear additives that are really helpful to recent wear. The same additives are useful in flat tappet cam motors, and also very good for metal to metal wear. Additives such as zinc, and molybendium can damage some platinum catalytic converters.

1

Archimedes001

Sep 9, 2021 5:51 PM

798 Comments

Joined Nov 2005

Archimedes001Sep 9, 2021 5:51 PM

798 Comments

Quote from KMan

:

Thanks, very detailed and informative. The only part I don't get is why this would affect the cat, since the oil is supposed to remain in the engine block. Are we talking blow-by and oil leakage into the combustion chamber, that over time affects the cat?

There is a small amount of oil and components that is burned off (cylinder wall residual oil) as the engine runs, this includes metal ash such as the phosphorus component of ZDDP which then deposit on the face of the catalytic converter and eventually coat it so that it runs below the threshold of the 02 sensors and bam check engine light.

Additive companies already make a low volatility ZDDP but even those still have a small percentage that volatilizes. So yes you're right it's just oil that somehow finds it way out of the engine sump.

Last edited by MrMotorOil September 9, 2021 at 11:11 AM.

1

1-Gallon Castrol Assuron HD Diesel SAE 30 Motor Oil $8.04 + Free S&H w/ Walmart+ or orders $35+

$8.04

$20

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