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Mobil1 0w40?

From Boondocks' article:

Real World Test Results

Are there any "real world" examples of long motorcycle engine life using automotive oils? There is a good one in the June 1996 issue of Sport Rider magazine in a report called the "100,000 mile Honda CBR900RR." The owner used conventional Castrol GTX oil, 10W40 in the winter, 20W50 in the summer. He changed it every 4,000 miles, changing the filter every OTHER oil change. No valve clearance adjustments were required after the initial one at 16,000 miles. And a dyno test against the same model with only 6,722 miles showed torque and horsepower virtually identical. The 100,000 mile bike was even used for some racing. In a subsequent follow-up, the same CBR had passed 200,000 miles and was still going strong!
Click to expand...

I've always used regular Castrol GTX in my bikes and cars (rated SM, SL, SJ, SH), and never had any problems whatsoever. I just picked up two five quart jugs at Meijer (like a walmart) for $8.99 each.
 
Griffin said:
From Boondocks' article:



I've always used regular Castrol GTX in my bikes and cars (rated SM, SL, SJ, SH), and never had any problems whatsoever. I just picked up two five quart jugs at Meijer (like a walmart) for $8.99 each.
Click to expand...
Griffin, that's what I plan on doing next time ...wish I wasn't so hasty at the dealer, and listened to that guy.. BUT...I was just happy to get some of my m/c stuff.... A girl with a credit card is a dangerous thing ;)
 
I did not see any recomended 20/50 brands in that article which he seems to agree is better in hot climates which I'm sure DFW TX counts as one.
 
Boondocks said:
Mobil 1 used to be a Group IV PAO (polyalphaolefin) synthetic, but is now Group III. Castrol Syntech is also Group III.

Delvac-1, AMSOil, Redline and Motul are supposed to be Group IV oils.
Click to expand...
So Mobile went with a blend instead of a pure synthetic, is that correct? And they pushed the price up 20% in the last three years.
 
duaneage said:
So Mobile went with a blend instead of a pure synthetic, is that correct? And they pushed the price up 20% in the last three years.
Click to expand...

Mobil used to make (for Mobil 1) and sell Group IV PAO synthetic stock to other producers. Castrol switched to using blends using Group III basestocks and calling it synthetic. Mobil sued them. After Mobil lost their lawsuit against Castrol in 1999, most "synthetic" oil has been made with Group III petroleum derived basestocks, which cost substantially less than Group IV PAO synthetic basestocks. Mobil has to compete, which is undoubtedly why they made the change.

Group III synthetics may contain some Group IV basestock to improve low temperature performance.
 
I find it interesting that the M/c oils had the highest viscosity breakdown.:-k
 
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