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Engine Oil Manufacturers make racing oil with high viscosity for high protection, and easy street/trail riding oil with low viscosity at a lower price. Keeping with that plan I devised 3 main riding groups and chose oils for each group based on their 200C (392F) viscosity. This high temp viscosity isn't listed by the oil makers. It has to be calculated based on the listed 40C and 100C viscosities. A hot racing engine can have 200C as its upper cylinder temperature.
Why not use a high viscosity oil for easy riding? High viscosity synthetic oil doesn't burn as well as mineral oil and so causes more spooge. Also that characteristic means it won't contribute to power like a mineral oil does. So if I used Motul 800 on my street bike I'd have less power and more spooge. Group 2 mineral oil is actually pretty damn good. Its flash point temperature is only 16% less than that of synthetic oil. I use SynPlus for my street bike and it has extra detergent additive for cleanliness. I know that because it is rated FD. Its two competitors are only rated FB which means they will leave more deposits. The oils I selected for moderate riding are either rated FC or FD. None of the extreme riding oils are FD.
The 200C viscosity range I selected for the 3 groups are under 2.6 for Easy Riding, 2.6 to 3.2 for Moderate Riding, and over 3.2 for Extreme Riding.
One way to tell which group your engine belongs to is by knowing what is the best NGK spark plug heat range for your engine. Under #8 is Easy Riding, #8 is Moderate Riding, and over #8 is Extreme Riding. You know you have the right heat range if, after making sure the main jet is selected to give the best power under load, the color change line on the ground electrode is near the halfway mark.
EASY RIDING (water cooled street/trail) All recommended oils are rated FD for their high detergent level to lessen engine deposits.
Oils made of mostly group 2 oil - Amalie SynPlus (200C visc 1.75) These two runner-ups are rated FB: Castrol Go! (2.2), Spectro Oils 2T (1.97)
Semi-Synthetic Oils - Motul Scooter Expert (2.17), Maxima Premium 2 (2.15), Motul 510 (1.76)
Full Synthetic - Maxima Super M (2.5)
MODERATE RIDING (water cooled MX, air cooled street/trail)
Semi-Synthetic - Bel-Ray MC-1 (3.22), Motul 800 Off Road (3.1), Maxima Castor 927 (2.7)
Full Synthetic - Maxima Formula K-2 (2.88), Silkolene Pro 2 (2.79), Silkolene Comp 2 Plus (2.76)
EXTREME RIDING (karts and any high RPM engines)
Semi-Synthetic - Motul 800 Road Racing (3.63), Castrol A747 (3.55), Redline Allsport (3.54)
Full Synthetic - Repsol Moto Racing (3.41), Motul Kart Grand Prix (3.29), Pro Honda HP2 (3.2)
My engine oils page now lists the 200C viscosity for each oil listed. This is not available on the oils promotional literature. dragonfly75.com/moto/oil.html
Why not use a high viscosity oil for easy riding? High viscosity synthetic oil doesn't burn as well as mineral oil and so causes more spooge. Also that characteristic means it won't contribute to power like a mineral oil does. So if I used Motul 800 on my street bike I'd have less power and more spooge. Group 2 mineral oil is actually pretty damn good. Its flash point temperature is only 16% less than that of synthetic oil. I use SynPlus for my street bike and it has extra detergent additive for cleanliness. I know that because it is rated FD. Its two competitors are only rated FB which means they will leave more deposits. The oils I selected for moderate riding are either rated FC or FD. None of the extreme riding oils are FD.
The 200C viscosity range I selected for the 3 groups are under 2.6 for Easy Riding, 2.6 to 3.2 for Moderate Riding, and over 3.2 for Extreme Riding.
One way to tell which group your engine belongs to is by knowing what is the best NGK spark plug heat range for your engine. Under #8 is Easy Riding, #8 is Moderate Riding, and over #8 is Extreme Riding. You know you have the right heat range if, after making sure the main jet is selected to give the best power under load, the color change line on the ground electrode is near the halfway mark.
EASY RIDING (water cooled street/trail) All recommended oils are rated FD for their high detergent level to lessen engine deposits.
Oils made of mostly group 2 oil - Amalie SynPlus (200C visc 1.75) These two runner-ups are rated FB: Castrol Go! (2.2), Spectro Oils 2T (1.97)
Semi-Synthetic Oils - Motul Scooter Expert (2.17), Maxima Premium 2 (2.15), Motul 510 (1.76)
Full Synthetic - Maxima Super M (2.5)
MODERATE RIDING (water cooled MX, air cooled street/trail)
Semi-Synthetic - Bel-Ray MC-1 (3.22), Motul 800 Off Road (3.1), Maxima Castor 927 (2.7)
Full Synthetic - Maxima Formula K-2 (2.88), Silkolene Pro 2 (2.79), Silkolene Comp 2 Plus (2.76)
EXTREME RIDING (karts and any high RPM engines)
Semi-Synthetic - Motul 800 Road Racing (3.63), Castrol A747 (3.55), Redline Allsport (3.54)
Full Synthetic - Repsol Moto Racing (3.41), Motul Kart Grand Prix (3.29), Pro Honda HP2 (3.2)
My engine oils page now lists the 200C viscosity for each oil listed. This is not available on the oils promotional literature. dragonfly75.com/moto/oil.html