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There are two main issues we need to worry about when choosing the best oil for our Mercedes 126. Costly repairs can be avoided if we get this decision right.

VISCOSITY

Picking the viscosity of your oil used to be a relatively simple decision, and I believe it still is. I say "used to be" because the oil companies now offer a vast array of products, many with zero- and five-weight winter ratings, and some with huge multigrade ranges. Furthermore, a school of thought has emerged in certain circles, apparently influenced by analogies from human biology, that leads many to purchase new-fangled oils that are totally inappropriate for our cars.

The theory goes that since most engine wear occurs on cold starts, we want an oil that flows freely when it is cold. Heavier oils, it is said, are as dangerous to our engines as thick blood is to a human body with constricted arteries. High oil pressure, just like high blood pressure, signifies flow restrictions and is unhealthy. While there is an obvious truth here, this thinking can be taken too far.

The oil companies have had to respond to changes in demand patterns. Modern car engines are being manufactured with very fine tolerances. The major car companies have switched to thinner oils, typically 5W-20 or 5W-30, partly because thinner oil passages need thinner oils, but also because thinner oils tend to improve fuel economy. But the engines in our 126 cars were not manufactured with these tolerances.

Mercedes tells us in no uncertain terms, in the owners manual, which oil we should be using, and the main consideration is climatological. The thin oils commonly used in modern cars would only be appropriate in Arctic climates. For the vast majority of users, the ideal viscosity is 15W-40, and that is what Mercedes put in these cars at the factory. Owners in warm climates where frost is rare can safely use 20W-50. Contrary to the modern over-analysis mentioned above, this heavier oil has proven to work wonderfully well. I am personally aware of one 420SEL that surpassed 800,000 miles down here in Florida. The owner used the cheapest 20W-50 he could find.

ZDDP

The other major issue we must consider is the strength of the anti-wear additive package. In 2007, the federal government required oil companies to reduce the amount of ZDDP in their oils. The aim of the regulatory change was to lengthen the service life of catalytic converters, as ZDDP is somewhat hostile to those devices. This zinc and phosphorous compound is a highly effective anti-wear agent in what is referred to as "boundary lubrication" situations; i.e. when high-pressure metal-on-metal contact occurs within the engine. Such contact is less of a concern in modern engines with roller cams, but older engines, especially those with flat tappets, need the protection that ZDDP provides.

Consequently, the latest API certifications - SM for gasoline engines and CJ-4 for diesels - bespeak weaker anti-wear packages. Some oil companies have attempted to compensate for the reduction in ZDDP by adding other agents such as molybdenum, but they simply aren't as effective in older engines.

Many Mercedes owners have known about ZDDP for years and found themselves drawn to heavy-duty, diesel-rated oils like Shell Rotella, Chevron Delo, and Mobil Delvac (which also happen to be the ideal weight). These oils typically had much stronger anti-wear packages than gasoline-rated oils, in addition to the detergent/dispersant packages needed to deal with the soot produced by diesels. Indeed, such oils must bolster the anti-wear package because the detergents may tend to wash the oil off internal parts. Unfortunately, even these oils were reformulated and are no longer as beneficial.

Research suggests that the optimum level of zinc is in the region of 1300ppm and the ideal level of phosphorous is about 1200ppm. Of the new CJ-4 diesel oils, the only one that seems to meet those tests is Chevron Delo 400LE. But there are other options.

If you live in a climate where 20W-50 is viable, the best option is probably one of the "racing" oils, especially Brad Penn and Valvoline VR-1. The latter is readily available at Advance Auto Parts; the former requires mail order for most people. The only drawback to these oils is that they are not intended to live in the crankcase for long periods. But since you'll be changing your oil at least every 3,000 miles, that won't be a problem, will it! Alternatively, Amsoil's synthetics have retained strong ZDDP levels and could be used for extended drain intervals if needed.

If you need 15W-40, a lesser-known but very good option is Swepco. Porsche 911 owners swear by it. But, if you can find it, diesel-rated oils that have retained the older CI-4/SL certification remain appealing. One such oil is Mystik 15W-50, sold by Tractor Supply. This oil is not well known at all outside trucking and agricultural circles, but it has a terrific specification and is very affordable.

For more helpful repair advice, click on Mercedes 126 repair.

And to learn how to protect yourself while you're actually driving your well-maintained vehicle, check out the following site on finding traffic cameras. You'll be glad you did!

Testing Times in WA as Rains Prove Elusive

Bankwest has been providing services to Rural and Agribusinesses for over 100 years. We've learned many things in that time, but above all what we've come to understand is that you need banking products that are customised to meet the unique challenges of your industry.

You will find the latest rural and agribusiness insights in this story.

Following one of the worst droughts in history last year, summer rainfall has been average through most of the south west, with typically limited rain falling through most regions. Currently only Mullewa, a small area around Nungarin and the southern regions have available plant moisture, leaving growers to rely on rain during the season. Projections based on the last ten years of rainfall, combined with current stored soil moisture levels, indicate a decile 3-4 year.

Both the Bureau of Meteorology and the Department of Agriculture and Food are predicting a dry start to the season with below average rainfall through May and June. Sea surface temperatures are warm to the west of WA and cool to the north, blocking fronts and limiting rainfall to the south coast. Barometric pressures, which were below average during summer are now rising and are also reducing the impact of fronts passing through.

As the year progresses, models vary, with equal chances of above and below average rainfall through the balance of the season (WA's new statistical season forecasting model indicates average to above average rainfall).

In summary, conditions do not appear favourable for 2011. But it's not all bad news: with wheat estimated to rise above $300/t by year end, prices should cushion the potential impact of below average yields.

COMMODITIES

WHEAT

Last week's release of the USDA Supply and Demand report (and the negative market reaction to it) did little to assist wheat prices. However, global stocks remain tight and the next three months of the growing season will determine if supplies dip further or rise steadily back to more comfortable levels. Corn prices have been driving down the wheat price as good growing conditions continue across the US corn belt. In line with Chicago's downward run the local cash market has unwound by $20/t over the past five weeks. But it's important to note that basis has remained static, with the delay in opening rains playing a small but obvious role here.

BARLEY

Barley has enjoyed a solid increase over the past three weeks (up nearly $20/t) and the spread has closed by a few dollars. The uplift in malt prices was driven by an expected increase in consumption of nearly 2%. The closing of the spread was largely due to a revaluing of feed grade barley against feed grade prices offered for wheat via the current APW2 and N1 multigrade contracts.

CANOLA

The canola cash price has continued its recent upward climb and is currently nudging $615/t. The temporary increase in soybeans stocks appears to have done little to dampen global values, while an improvement in local canola prices is being driven by a depreciating $AUD to $CAD rate.

LIVESTOCK

As farmers begin to exit livestock to make room for the cropping program, prices have softened across the board. With much of the processing pipeline already committed, there has been limited demand for the remaining animals on offer which, in turn, is applying further downward pressure on prices.

WOOL

After a brief fall earlier this month wool prices have now recovered, with the EMI currently sitting at 1323c/kg. As supplies continue to increase due to the high prices on offer it's likely that wool will start the 2011/12 financial year at its lowest stock levels on record.

About the Author

Hugh Mc Innes loves the outdoors and recently bought a farm in the Australian outback. He wanted it to be a home as well as a business, so he set himself a goal to expand and develop the farm and through agribusiness finance, he obtained a rural loan to help him achieve his goal.

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