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#1 User is offline   JeepinIan 

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Posted 29 May 2014 - 11:32 AM



By: Dan Arcy, Global OEM Technical Manager, Shell Global Solutions

No you will not.

No, you will not. This is an all too common misconception, and one with no scientific data to support it.

When switching from a mineral oil to a synthetic, or vice versa, you will potentially leave a small amount of residual oil in the engine. That’s perfectly okay because synthetic oil and mineral-based motor oil are compatible with each other.

There is no problem with switching back and forth.

And to be clear, there is no problem with switching back and forth between synthetic and mineral based oils.

In fact, many of our customers who operate in areas where temperature fluctuations can be especially extreme, switch from mineral oil to synthetic oil for the colder months.

They then switch back to mineral oil during the warmer months.

There was a time, years ago, when switching between synthetic oils and mineral oils was not recommended if you had used one product or the other for a long period of time.

Some operators experienced problems with seal leakage and high oil consumption but changes in additive chemistry and seal material have taken care of those issues.

Why change oils from mineral to synthetic? The biggest benefit of changing to synthetic motor oil in the winter is improved start-ability, which is the ability of a vehicle to pull away from a dead stop on a grade. While conventional oil gets thicker in colder temperatures, synthetic oil maintains its viscosity ensuring greater oil flow in the engine when pulling away from a dead stop in cold weather.

There is also semi-synthetic motor oil, which is a mix of synthetic base oil and mineral base oil. Many operators are experiencing successes similar to seasonal use of synthetics by going with this option.

With that said, there is no need to be concerned about compatibility of synthetic, mineral or semi-synthetic engine oil. As I’ve stated, you can often benefit by changing to synthetic or semi-synthetic oil in colder climates.

Just be sure you’re always using a quality product like Shell Rotella® motor oils to get the protection you need

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Ian Stewart

If you don't fight for the trails, there won't be any trails to fight for.

What you get by achieving your goals is not as important as what you become by achieving your goals.
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"War is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and patriotic feeling that thinks that nothing is worth war is much worse. The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." ....

John Stuart Mill

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