Conclusion Base stock oils (especially the newer GF-3 SL) have better resistance to heat like a synthetic does.
The higher the spread between the bottom number and the top number the more VI improvers are relied on for maintaining the viscosity. Better to keep the numbers closer.
All base oils film strength will shear under stress or pressure. The real way to help prevent wear is to maintain higher levels of antiwear additives. This in conjunction with a good base stock which resists breakdown to high heat.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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