Q: Best motor oil for a 04 bmw 325ci ow40w or 5w40w full synthetic

asked by on October 24, 2017

Best motor oil to buy
My car has an automatic transmission.

Change Oil and Filter $92.33 - $165.78 Get a Quote

The difference between these two oils is primarily the viscosity or thickness of the oil. Depending on the brand, there may be a number of other additives in play as well, however the most important component of the oil is the viscosity and ability to protect against thermal breakdown due to heat. Generally, when the weather is colder outside you will want a thinner oil to allow the oil to flow easier through the motor allowing it to properly lubricate parts. When the weather is hotter outside, you will want a thicker oil to prevent it from what is called “thermal breakdown” and to keep it layering the internal engine parts with the proper lubrication. I would recommend having an expert from Your Mechanic come to your home to perform an oil change service on your car to determine the best option for your vehicle.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

volkswagon touareg

Hi Sonia. Thanks for the question tonight. To be honest, both repairs could be rather costly. Replacing a timing chain on a Volkswagen Touareg requires removing several components in order to gain access, while the issue of oil in the...

Car slow down itself

If your vehicle is slowing down all by itself or having trouble accelerating, it is possible that the brake calipers on the front of the vehicle are locking up. This will cause the brakes to be applied at all times....

Do I need alignment after replacing front shocks and struts

Some vehicles have fixed front camber which is typically the only alignment criteria (measure) that would be affected by strut replacement. However, your vehicle does have adjustable camber settings and so, yes, the vehicle would have to be aligned if...

Speed sensor

Hello, thank you for writing in. There are two types of "speed sensors" on the vehicle. Regardless of which one you are referring to, the answer is yes. The transmission speed sensors are the same for both automatic and manual...

Sputtering problems

Hello. Engine sputtering and performance issues can be caused by many things. If you have already replaced those components then I would move on to looking at a few other things. Issues with the ignition, engine management, or fuel systems...

serpintine belt and tensioner pulley replacement.

Hello. Thanks for writing in. Obviously you will want to clear some room to have access to the tensioner. This is easiest done by removing the radiator. Once you have the old tensioner removed, you simply reverse the process to...

Ticking noise from engine

Hello. A ticking noise can be caused by a variety of components. Does it increase in speed with the engine? Does they typically happen in while warm or cold, or does it happen constantly? It may be a lifter or...

Catalytic converter is working, but will not kick in to pass smog.

The O2 sensors monitors catalytic converter efficiency, it does not control the catalytic converter. Catalytic converters either work well enough or they don't. If it won't kick in, it needs a new one. Cat's work independent of all other systems....

Car turn over but stalls out

Hi. If the engine will turn over and try to start, then it may be a problem with fuel pressure or one of the engine sensors. It is common for the fuel pump to fail as well as the crank...

Related articles

A Buyer’s Guide to the 2012 BMW ActiveHybrid 5
In In 2012, BMW brought out the turbocharged 3.0 liter engine ActiveHybrid 5. The ActiveHybrid 5 is a real wheel, four door sedan that holds five passengers. Key Features Key features of the ActiveHybrid include the 3.0 liter inline...
A Buyer's Guide to the 2012 BMW X3
If If you like high-end SUVs, the 2012 BMW X3 is definitely worth taking a look at. It’s a great mixture of luxury, utility and convenience. Key Features The Servotronic power steering on this SUV is excellent for giving you...
Top 10 Factors to Consider When Buying a Luxury Car
The The idea of owning a luxury car is appealing. The glossy paint, swoopy lines, and prestigious badges speak of the owner’s success in life, while the interior opulence offers scented leather surfaces, high-tech telematic devices, and all the creature-comfort...