Where Customers Come First Since 1936

Fuel Gresham, Hillsboro & Portland, OR - Marc Nelson Oil Products

Crankcase Engine Oils and Aviation Oils in Gresham, Hillsboro & Portland, Oregon (OR)

Marc Nelson Oil Products carries only the finest crankcase engine oils from the Phillips 66 family of brands to protect and extend the life of your engine.

How much do you value the engine in your vehicle? Think about it, because the life of your engine depends in part on the quality of the oil you put in it, oil is the lifeblood of your car's engine. Trust your car's engine to people who appreciate it as much as you do.

So what should I buy?

Quality Counts! You've put out the cash on your new pride and joy, so don't cheap out on the oil or be persuaded by gimmicks. It doesn't matter what sort of fancy marketing goes into engine oil or how bright and colorful the packaging is, it's what's written on the packaging that counts and whether you buy it from a reputable retailer like MNOP. If you have any questions about which oil is right, contact us for more information and we will be glad to help.

What does oil actually do?

The point of engine oil is primarily to stop all the metal surfaces in your engine from grinding together and tearing themselves apart from friction while transferring heat away from the combustion cycle. Engine oil must also be able to hold all the by-products of combustion, such as silica (silicon oxide) and acids in suspension. It cleans the engine of these chemicals and build-ups and keeps the moving parts coated in oil. Finally, engine oil minimizes the exposure to oxygen and thus oxidation at higher temperatures. It does all of these things under tremendous heat and pressure.

Oil Shelf Life

In general, liquid lubricants (oils, not greases) will remain intact for a number of years. The main factor affecting the life of the oil is how they are stored. Exposure to extreme temperature changes and moisture will reduce the shelf life of the lubricants. Keep them sealed and unopened.

Technically, engine oils have shelf lives of four to five years. However, as years pass, unused engine oils can become obsolete and fail to meet the technical requirements of engines. But this is only really a concern if you've bought a brand new car but have engine oil you bought for the previous car. Water contamination in a lubricant can be detected by a "milky" appearance of the product.

If your unopened containers of engine oil are more than three years old, read the labels to make sure they meet the latest industry standards for your current vehicle.

As a general rule, the simpler the oil formulation, the longer the shelf life. The following is a guideline under protected conditions:


Base Oils, Process Oils

Hydraulic Oils, Compressor Oils, General Purpose Lubricating Oils

Engine Oils and Transmission Oils

Industrial and Automotive Gear Oils

Metal Working and Cutting Oils

Shelf Life

3 Years

2 Years

3 Years

2 Years

1 Year

How do I read the numbers around the 'W' - i.e. 5W40?

Single grade oils get too thin when hot for most modern engines which is where multigrade oil comes in. The idea is simple - use science and physics to prevent the base oil from getting as thin as it would normally do when it gets hot. The number before the 'W' is the 'cold' viscosity rating of the oil, and the number after the 'W' is the 'hot' viscosity rating. So 5W40 oil is one which behaves like a 5-rated single grade oil when cold, but doesn't thin any more than a 40-rated single grade oil when hot. The lower the 'W' (winter), the easier the engine will turn over when starting in cold climates.


1977 Claxter Road NE, Salem, OR 97301 | 503.363.7676

© 2002 Marc Nelson Oil Products | All Rights Reserved

800.523.7676  •  503.363.7676  •  503.363.5822 (Fax)


Why Choose

Marc Nelson Oil Products?

We believe that the history, philosophy, product mix and success of Marc Nelson Oil Products should make your choice of petroleum distributors a simple one. Nowhere else will you find a match for our commitment to customer service, and from no other vendor will you find the mix of petroleum products, delivery methods and expertise that combine to make us the right choice, every time. Whether you're a large business running a fleet of a hundred vehicles, or a small shop with only one or two-if you use petroleum products to deliver services that meet your clients' needs, Marc Nelson Oil Products is the choice that will assure your success.

76 Lubricants
Phillips 66
VP Racing
Pacific Pride